10+ Best Open-Source Alternatives to Your Favorite SaaS

Hey there! Have you ever caught yourself wondering if there’s a free, open source alternatives tool that’s just as awesome as the pricey SaaS software you’re using? Well, you’re in luck, we've rounded up some hidden gems that can totally replace the big names you know and love. These open source alternatives are powerful, customizable, and perfect for developers and SaaS users who want to save money without sacrificing quality. Ready to explore and save some cash? Let’s get started! Open Source SaaS Alternatives 1. AppFlowy – The leading open-source Notion alternative What It Does: AppFlowy, is an open source alternative to Notion that brings projects, wikis, and teams together in one sleek, AI-collaborative workspace. The best part? You keep full control of your data—no compromises! Why use AppFlowy?: It’s lightweight, customizable, and built with privacy in mind, making it a solid pick for anyone who wants Notion’s vibes without the subscription. Main Features: AI Collaboration: Smart tools to boost teamwork and productivity. Data Control: Self-host it to keep your info secure and private. Flexible Workspaces: Organize projects, notes, and wikis your way. Check It Out: appflowy.io | Follow: @appflowy 2. NocoDB – Build Databases As Spreadsheets (Airtable Alternative) What It Does: NocoDB turns database-building into a breeze by blending the simplicity of spreadsheets with no-code power—an awesome open source alternative to Airtable. Why use NocoDB?: It’s perfect for creating custom databases fast, whether you’re managing data for a startup or a side project. Plus, it’s free and flexible! Main Features: Spreadsheet Interface: Build and edit databases like you’re using Excel. No-Code Simplicity: No coding skills? No problem—get started in minutes. Customizable: Tweak it to fit your workflow with ease. Check It Out: nocodb.com | Follow: @nocodb 3. Hoppscotch – Supercharge Your API Development (Open Source Alternative to Postman) What It Does: Hoppscotch is an open-source API development ecosystem that makes creating and testing API requests a total time-saver—say goodbye to Postman’s price tag! Why use Hoppscotch?: It’s lightweight, fast, and community-driven, giving devs everything they need to streamline API workflows without the bloat. Main Features: Quick Testing: Send and test API requests in real-time. Team Collaboration: Share collections with your crew effortlessly. Open Ecosystem: Extend it with custom scripts and integrations. Check It Out: hoppscotch.io | Follow: @hoppscotch_io Featured Tool: Jetship – Kickstart Your SaaS with ThemeSelection’s Next.js Boilerplate Speaking of building smarter, we at ThemeSelection have something special for you: Jetship, our Next.js SaaS boilerplate that we recently launched built on Next js, ShadCN, Tailwind and powered by Supabase. It’s not an open source alternative but a turbocharged starting point for your next big idea. With pre-built goodies like authentication, payments, and dashboards, Jetship lets you launch a polished, scalable SaaS app in record time. It’s customizable, developer-friendly, and designed to save you from reinventing the wheel—so you can focus on what makes your SaaS unique. Why You’ll Love It: Ready-to-Go Components: Auth, subscriptions, and more—out of the box. Brand-Friendly Design: Tweak the look to match your vision. Built to Scale: A solid Next.js foundation for your growing app. Get Started: JetShip Nextjs Starter Kit | Follow: @Theme_Selection 4. Supabase – Backend Bliss in Minutes (Firebase Alternative) What It Does: Supabase is a Backend-as-a-Service (BaaS) platform built on PostgreSQL, offering an open-source way to whip up web and mobile backends faster than you can say “Firebase.” Why use Supabase?: It’s got a simple setup, a user-friendly interface, and all the firepower you need to build scalable apps without the proprietary lock-in. Main Features: Real-Time Database: Instant updates with PostgreSQL magic. Auth Made Easy: Built-in authentication for users and APIs. Scalable & Open: Self-host or use their cloud—no limits! Check It Out: supabase.com | Follow: @supabase 5. Coolify – Deploy Like a Pro (Heroku/Netlify/Vercel Alternative) What It Does: Coolify is a self-hosted, open-source deployment platform that lets you easily manage and launch apps—a killer substitute for Heroku, Netlify, or Vercel. Why use Coolify? It’s all about control and cost—host it yourself, deploy anything, and skip the monthly bills. Main Features: One-Click Deploys: Launch apps without the hassle. Self-Hosted Freedom: Run it on your server or VPS. Multi-App Support: Manage web apps, databases, and more in one place. Check It Out: coolify.io | Follow: @coolifyio 6. Plane – Project Management, Open-Source Style (JIRA/Linear/Monday/Asana

Mar 27, 2025 - 15:23

10+ Best Open-Source Alternatives to Your Favorite SaaS

Hey there! Have you ever caught yourself wondering if there’s a free, open source alternatives tool that’s just as awesome as the pricey SaaS software you’re using?

Well, you’re in luck, we've rounded up some hidden gems that can totally replace the big names you know and love.

These open source alternatives are powerful, customizable, and perfect for developers and SaaS users who want to save money without sacrificing quality.

Ready to explore and save some cash? Let’s get started!

Open Source SaaS Alternatives

1. AppFlowy – The leading open-source Notion alternative

What It Does: AppFlowy, is an open source alternative to Notion that brings projects, wikis, and teams together in one sleek, AI-collaborative workspace. The best part? You keep full control of your data—no compromises!

Why use AppFlowy?: It’s lightweight, customizable, and built with privacy in mind, making it a solid pick for anyone who wants Notion’s vibes without the subscription.

Main Features:

AI Collaboration: Smart tools to boost teamwork and productivity.
Data Control: Self-host it to keep your info secure and private.
Flexible Workspaces: Organize projects, notes, and wikis your way.

Check It Out: appflowy.io | Follow: @appflowy

2. NocoDB – Build Databases As Spreadsheets (Airtable Alternative)

What It Does: NocoDB turns database-building into a breeze by blending the simplicity of spreadsheets with no-code power—an awesome open source alternative to Airtable.

Why use NocoDB?: It’s perfect for creating custom databases fast, whether you’re managing data for a startup or a side project. Plus, it’s free and flexible!

Main Features:

Spreadsheet Interface: Build and edit databases like you’re using Excel.
No-Code Simplicity: No coding skills? No problem—get started in minutes.
Customizable: Tweak it to fit your workflow with ease.

Check It Out: nocodb.com | Follow: @nocodb

3. Hoppscotch – Supercharge Your API Development (Open Source Alternative to Postman)

What It Does: Hoppscotch is an open-source API development ecosystem that makes creating and testing API requests a total time-saver—say goodbye to Postman’s price tag!

Why use Hoppscotch?: It’s lightweight, fast, and community-driven, giving devs everything they need to streamline API workflows without the bloat.

Main Features:

Quick Testing: Send and test API requests in real-time.
Team Collaboration: Share collections with your crew effortlessly.
Open Ecosystem: Extend it with custom scripts and integrations.

Check It Out: hoppscotch.io | Follow: @hoppscotch_io

Featured Tool: Jetship – Kickstart Your SaaS with ThemeSelection’s Next.js Boilerplate

Speaking of building smarter, we at ThemeSelection have something special for you: Jetship, our Next.js SaaS boilerplate that we recently launched built on Next js, ShadCN, Tailwind and powered by Supabase.

It’s not an open source alternative but a turbocharged starting point for your next big idea. With pre-built goodies like authentication, payments, and dashboards, Jetship lets you launch a polished, scalable SaaS app in record time.

It’s customizable, developer-friendly, and designed to save you from reinventing the wheel—so you can focus on what makes your SaaS unique.

Why You’ll Love It:

Ready-to-Go Components: Auth, subscriptions, and more—out of the box.
Brand-Friendly Design: Tweak the look to match your vision.
Built to Scale: A solid Next.js foundation for your growing app.

Get Started: JetShip Nextjs Starter Kit | Follow: @Theme_Selection

4. Supabase – Backend Bliss in Minutes (Firebase Alternative)

What It Does: Supabase is a Backend-as-a-Service (BaaS) platform built on PostgreSQL, offering an open-source way to whip up web and mobile backends faster than you can say “Firebase.”

Why use Supabase?: It’s got a simple setup, a user-friendly interface, and all the firepower you need to build scalable apps without the proprietary lock-in.

Main Features:

Real-Time Database: Instant updates with PostgreSQL magic.
Auth Made Easy: Built-in authentication for users and APIs.
Scalable & Open: Self-host or use their cloud—no limits!

Check It Out: supabase.com | Follow: @supabase

5. Coolify – Deploy Like a Pro (Heroku/Netlify/Vercel Alternative)

What It Does: Coolify is a self-hosted, open-source deployment platform that lets you easily manage and launch apps—a killer substitute for Heroku, Netlify, or Vercel.

Why use Coolify? It’s all about control and cost—host it yourself, deploy anything, and skip the monthly bills.

Main Features:

One-Click Deploys: Launch apps without the hassle.
Self-Hosted Freedom: Run it on your server or VPS.
Multi-App Support: Manage web apps, databases, and more in one place.

Check It Out: coolify.io | Follow: @coolifyio

6. Plane – Project Management, Open-Source Style (JIRA/Linear/Monday/Asana Alternative)

What It Does: Plane is an open-source project management tool designed to track issues, run sprints, and map out product roadmaps. It is a perfect open source alternative for JIRA, Linear, Monday, or Asana.

Why Developers & SaaS Love It: It’s clean, intuitive, and free, giving teams a flexible way to stay organized without the corporate price tag.

Main Features:

Issue Tracking: Keep tabs on bugs and tasks effortlessly.
Sprint Planning: Run cycles like a pro with built-in tools.
Roadmap Views: Visualize your product’s future with clarity.

Check It Out: plane.so | Follow: @planepowers

7. Mattermost – The Open-Source Slack Alternative

What it does: Mattermost is an open source alternative to Slack used as a collaboration platform designed with developers and technical teams in mind. It's a self-hosted messaging hub that brings chats, files and tools into one secure place.

Why use Mattermost? It’s all about control and flexibility. You can host it yourself, tweak it to fit your needs, and keep your data safe behind your firewall. Plus, it has deep integrations and a community-driven vibe that keeps it evolving.

Main Features

Real-time collaboration
Secure, Scalable and self-hosting messaging
1-1 audio calls and screen sharing
Available in 20 languages
Channel-based messaging for web, desktop and mobile
Peer-to-peer forum, and many more...

Check It Out: mattermost.com | Follow: @Mattermost

8. PostHog - Open Source Analytics Powerhouse

What it Does: PostHog is an open-source powerhouse that combines product analytics, session replays, and feature flags into one neat package. It'an alternative to Mixpanel or Amplitude. It’s built to help you track user behaviour, test ideas, and improve your product, all while keeping your data in-house if you want.

Why use PostHog?: It’s got everything you need to dig into user insights without the SaaS subscription baggage. Self-host it for privacy and control, or use their cloud option for speed—either way, it’s a win for teams who want flexibility and power.

Main Features:

Event-Based Analytics: Automatically track clicks, page views, and custom events to see exactly how users interact with your app or site.
Session Replays: Watch real user sessions (with privacy controls) to spot bugs, pain points, or UX wins—no guesswork needed.
Feature Flags & A/B Testing: Test new features with specific users and measure the impact before going all-in.
Heatmaps: Visualize where users click and scroll to optimize your interface like a pro.
Self-Hosted or Cloud: Run it on your own servers for total control or use PostHog Cloud for a hassle-free setup—your call!

Check It Out: posthog.com | Follow: @posthog

9. n8n – Automate Like a Pro (Zapier Alternative)

What It Does: n8n is an open-source workflow automation tool that’s here to take on Zapier—and win! It lets you connect your favourite apps, APIs, and services to automate tasks without the hefty subscription fees. Whether you’re syncing data, triggering actions, or building complex workflows, n8n puts the power in your hands with a visual editor that’s as easy as it is powerful. Plus, you can host it yourself for total control—how cool is that?

Why use n8n? It’s a dream for anyone who loves automation but hates being locked into SaaS pricing or limitations. n8n is flexible, extensible, and built with developers in mind—think of it as your personal automation playground. From startups to SaaS teams, it’s perfect for saving time and streamlining processes without breaking the budget.

Main Features:

Visual Workflow Builder: Drag and drop to create automation—no coding required (though coders can dive in too!).
App Integrations: Connects with hundreds of tools like Slack, Google Sheets, and even custom APIs.
Self-Hosted Option: Run it on your server for privacy and unlimited workflows—bye-bye usage caps!
Custom Scripts: Add JavaScript or Python to supercharge your workflows with bespoke logic.
Community-Driven: Tons of pre-built nodes and an active community to keep things fresh and helpful.

Check It Out: n8n.io | Follow: @n8n_io

10. Cal.com – Your Friendly Calendly Alternative

What It Does: Cal.com is an open-source gem that makes scheduling a breeze—no more email ping-pong! It’s a Calendly alternative that lets you sync your calendars and share a link for folks to book time with you, all while keeping things simple and customizable.

Why use Cal? It’s free for individuals, self-hostable, and puts you in charge of your data. Perfect for devs who want control without the SaaS fuss.

Main Features:

Calendar Sync: Works with Google, Outlook, and Apple Calendar to avoid double bookings.
Custom Links: Set your availability and share a personal booking link.
Self-Hosted Option: Host it yourself or use their service—your call!

Try It: cal.com | Follow: @calcom

11. Documenso – Sign Docs Like a Pro (DocuSign Alternative)

What It Does: Documenso is an open-source buddy that takes on DocuSign, letting you sign and manage documents digitally with ease. It’s straightforward and keeps your data close.

Why use Documenso ? It’s privacy-focused and flexible—great for anyone tired of pricey e-signature tools. Plus, it’s got a human touch that makes signing feel less robotic.

Main Features:

Easy Signing: Sign docs fast with a clean, step-by-step flow.
Self-Hosting: Keep it on your servers for full control.
API Integration: Connect it to your workflows with an open API.

Check it out documenso.com | Follow: @documenso

12. Plausible – Simple Analytics (Google Analytics Alternative)

What It Does: Plausible is like a breath of fresh air for anyone tired of Google Analytics’ complexity and privacy baggage. It’s an open-source, lightweight tool that tracks your website’s traffic—think page views, visitors, and referrals—without cookies or invasive data grabs.

Why use Plausible ? It’s easy to use, privacy-first, and lets you keep your data close. Perfect for devs and SaaS folks who want insights without the clutter or consent pop-ups.

Main Features:

Cookie-Free Tracking: No banners needed—fully GDPR, CCPA, and PECR compliant.
Lightweight Script: Under 1KB, so your site stays fast.
Simple Dashboard: All your stats in one glance, no digging required.

Try It: plausible.io | Follow: @plausiblehq

13. Formbricks – Feedback That Feels Human (Typeform Alternative)

What It Does: Formbricks is an open-source champ for gathering user feedback—think surveys and forms—without the Typeform price tag. It’s built to help you understand your users through quick, targeted questions, all while staying flexible and privacy-friendly.

Why use Formbricks? It’s a developer’s dream—customizable and self-hostable—so you can skip the SaaS fees and still get real, actionable insights from your audience.

Main Features:

In-App Surveys: Ask users right where they are—no redirects.
Open-Source Freedom: Host it yourself or use their cloud option.
Granular Targeting: Reach specific users based on behaviour or traits.

Try It: formbricks.com | Follow: @formbricks

Why Make the Switch?

These open-source tools are more than just freebies—they’re crafted by passionate communities who get the grind of developers and SaaS builders like you. Think total flexibility, full control over your data, and the freedom to tweak every detail to match your vision.

Oh, and the cherry on top? You’re sidestepping those pesky subscription fees that eat into your budget.

It’s not just about saving cash—it’s about building smarter, on your terms.

Who wouldn’t jump at that?

About us

We, at ThemeSelection, provide selected high-quality, modern design, professional and easy-to-use premium and free Admin Panels, such as Bootstrap Templates, React Dashboard, Asp NET Core Templates, Vue Templates, Next JS Templates, UI Kits, and SaaS Boilerplate.

If you are looking for free admin templates, UI kits and themes then do visit our site…!!