Top 23 SaaS Open-Source Projects

1. react-starter-kit

   1 32 23,689 7.0 TypeScript

   Edge-native React template in a monorepo setup: Includes Vite frontend, Hono API, TanStack Router, shared types/utilities, and Terraform infra for scalable web development.

   

2. AppSignal

   www.appsignal.com sponsored

   Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.

   

3. awesome-oss-alternatives

   2 50 19,578 4.8 Python

   Awesome list of open-source startup alternatives to well-known SaaS products 🚀

   

   Project mention: awesome-oss-alternatives alternatives - launchdb and awesome-saas-directories | libhunt.com/r/awesome-oss-alternatives | 2026-07-27

4. open-saas

   3 47 16,044 8.5 MDX

   A 100% free modern JS SaaS boilerplate (React, NodeJS, Prisma). Full-featured: Auth (email, google, github, slack, MS), Email sending, Background jobs, Landing page, Payments (Stripe, Polar.sh), Shadcn UI, S3 file upload. AI-ready with tailored AGENTS.md, skills, and Claude Code plugin. One cmd deploy. Powered by Wasp full-stack framework.

   

   Project mention: JavaScript still can't ship a full-stack module | dev.to | 2026-06-29

   At Wasp, we've built and maintain the most popular open-source SaaS boilerplate starter, Open SaaS.

5. ABP

   4 36 14,443 10.0 C#

   Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides the fundamental infrastructure, cross-cutting-concern implementations, startup templates, application modules, UI themes, tooling and documentation.

   

   Project mention: We migrated a .NET app from ABP Framework to Granit without downtime - here's the playbook | dev.to | 2026-05-21

   We just finished moving a 15-module .NET service from ABP Framework to Granit — without a maintenance window, without a code freeze, and without a parallel run-everything-twice phase. The whole thing took about ten weeks running alongside feature work.

6. stack-on-a-budget

   5 18 12,453 7.6

   A collection of services with great free tiers for developers on a budget. Sponsored by Mockoon, the best mock API tool. https://mockoon.com

   

   Project mention: Stack on a Budget (Free Tier Driven Development FTDD) | news.ycombinator.com | 2026-06-14

7. polar

   6 22 10,300 10.0 Python

   Polar — A billing platform for the intelligence era

   

   Project mention: Shipping a paid Mac app outside the App Store in two days | dev.to | 2026-09-12

   I didn't want accounts, logins or a server. Polar sells the product, emails a license key, and exposes a customer-portal API that needs no API key in the client:

8. SaaS-Boilerplate

   7 5 7,440 7.2 TypeScript

   🚀🎉📚 SaaS Boilerplate built with Next.js + Tailwind CSS + Shadcn UI + TypeScript. ⚡️ Full-stack React application with Auth, Multi-tenancy, Roles & Permissions, i18n, Landing Page, DB, Logging, Testing

   

9. SaaSHub

   www.saashub.com sponsored

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

10. Marketing-for-Founders

    8 3 6,976 5.5

    Practical marketing resources to get the first 10 / 100 / 1000 users for your SaaS / App / Startup

    

    Project mention: Marketing for Founders | news.ycombinator.com | 2026-03-14

11. wave

    9 31 6,551 8.1 CSS

    Wave - The Software as a Service Starter Kit, designed to help you build the SAAS of your dreams 🚀 💰

    

12. saas-starter-kit

    10 12 4,940 8.4 TypeScript

    🔥 Enterprise SaaS Starter Kit - Kickstart your enterprise app development with the Next.js SaaS boilerplate 🚀

    

13. SaaS Boilerplate

    11 7 4,510 7.5 TypeScript

    Build your own SaaS business with SaaS boilerplate. Productive stack: React, Material-UI, Next, MobX, WebSockets, Express, Node, Mongoose, MongoDB. Written with TypeScript.

    

14. tenancy

    12 26 4,419 7.6 PHP

    Automatic multi-tenancy for Laravel. No code changes needed.

    

    Project mention: tenancy VS sprout - a user suggested alternative | libhunt.com/r/tenancy | 2026-07-04

15. OpnForm

    13 0 3,757 9.4 PHP

    Beautiful Open-Source Form Builder

    

16. metorial

    14 2 3,362 9.5 TypeScript

    Connect any AI model to 1200+ integrations (MCP, CLI, API)

    

    Project mention: Show HN: Metorial (YC F25) – Vercel for MCP | news.ycombinator.com | 2025-10-14

17. saas-boilerplate

    15 9 3,005 6.4 TypeScript

    SaaS Boilerplate - Open Source and free SaaS stack that lets you build SaaS products faster in React, Django and AWS. Focus on essential business logic instead of coding repeatable features! (by apptension)

    

18. Silex

    16 3 2,991 9.8 TypeScript

    Silex is an online tool for visually creating static sites with dynamic data. With the free/libre spirit of internet, together. (by silexlabs)

    

19. zenstack

    17 63 2,948 9.6 TypeScript

    Modern data layer for TypeScript apps - type-safe ORM, built-in access control, automatic query services

    

    Project mention: How to Save Bloated MCP with Code Mode | dev.to | 2026-05-13

    [Feature Request] Optimized Schema Generation for MCP Servers #2277

20. multi-tenant

    18 2 2,604 0.0 PHP

    Run multiple websites using the same Laravel installation while keeping tenant specific data separated for fully independent multi-domain setups, previously github.com/hyn/multi-tenant

    

21. Django-CRM

    19 9 2,437 9.3 Python

    Open Source CRM for Startups and enterprises. Django + SvelteKit · Self-hosted · Multi-tenant · Free forever

    

    Project mention: Show HN: Django-CRM – Open-Source CRM with PostgreSQL RSL Multi-Tenancy | news.ycombinator.com | 2026-03-02

22. CMSaasStarter

    20 3 2,367 6.3 Svelte

    A modern SaaS template/boilerplate built with SvelteKit, Tailwind, and Supabase. Includes marketing page, blog, subscriptions, auth, user dashboard, user settings, pricing page, and more.

    

23. Oqtane

    21 11 2,258 9.5 C#

    Oqtane is an open-source developer productivity platform for building modern .NET applications and websites that run on Web, Desktop and Mobile.

    

24. parabol

    22 36 2,013 9.7 TypeScript

    Free online agile retrospective meeting tool

    

25. SREWorks

    23 2 2,005 6.6 Java

    Cloud Native DataOps & AIOps Platform | 云原生数智运维平台

    

26. SaaSHub

    www.saashub.com sponsored

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    

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  1 project | news.ycombinator.com | 19 Sep 2026

• Show HN: Full SaaS payment integration with ~10 lines of code

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• agentic-product-launch alternatives - launchdb and awesome-saas-directories

  3 projects | 27 Jul 2026

• awesome-oss-alternatives alternatives - launchdb and awesome-saas-directories

  3 projects | 27 Jul 2026

• tenancy VS sprout - a user suggested alternative

  2 projects | 4 Jul 2026
• A note from our sponsor - AppSignal
  www.appsignal.com | 6 Oct 2026

  APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product. Learn more →

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Sponsored

Monitoring that respects your time & budget

APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.

www.appsignal.com