Saas GitHub Repositories (2026) · Open Source Tools

Eleven free Claude skills that clone any app: reverse-engineer it, rebuild it, test it for bugs, then fix what its users hate. Free, MIT.

We're rebuilding and open-sourcing the world’s software from scratch.

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

Polar — A billing platform for the intelligence era

BottleCRM: free, open-source (MIT) CRM with sales, support tickets and invoicing in one app. Unlimited users; self-host or use the hosted app.

All AI developers deserve to get paid. Turn your AI prototype into a paid SaaS with open-source infrastructure for usage billing, payments, attribution, affiliates, anti-abuse, and deployment.

A modern, open-source full-stack SaaS starter built with Next.js, TypeScript, MongoDB, and shadcn/ui a solid foundation for building scalable SaaS applications.

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

Open-source CRM for people and AI agents, with MCP, a company knowledge base and a self-hostable core.

Sell-Your-Saas is an Open Source solution to automate and sell any Web application as a SaaS service. Solution supports the deployment/undeployment of any application, customer dashboard, automatic invoicing and payment (credit card or sepa direct debit), management of a reseller network, security, backup, supervision and more...

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

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.

Model-agnostic agent-skills platform with a harness-free canonical layer, verified adapters, and the ccpi package manager. Explore at tonsofskills.com.

The React component library for startups, built with Chakra UI.

🌐 The all-in-one tool, for keeping track of your domain name portfolio. Got domain names? Get Domain Locker!

Rapyd Admin is an open-source admin panel for Laravel — a light alternative to Nova, Filament and Backpack

The application framework for vertical AI SaaS | auth, workspaces, billing, credits, execution boundary, page registry. You build the agent.

Condo is an Open Source property management SaaS that allows users to manage tickets, resident contacts, properties, payment tracking, create invoices, and oversee a service marketplace, all while offering an extension system for mini-apps, making it an ideal platform for property management companies and those servicing shared properties.

State-of-the-art Framework 🏗 for Cloud Computing ⛅️ Simulation: a modern, full-featured, easier-to-use, highly extensible 🧩, faster 🚀 and more accurate ☕️ Java 25+ tool for cloud computing research 🎓 Examples: https://github.com/cloudsimplus/cloudsimplus-examples

A SDK/library for decentralized web and distributing computing projects