Mailpit
Local SMTP server and web inbox for testing outgoing email
1048 tools in our directory are listed as open source, from 30 sections: Frameworks (89), Open Source (82), UI & Components (80), Dev Utilities (55) and 26 more sections.

Local SMTP server and web inbox for testing outgoing email


Open source search database with full-text and vector search

React component library with 120+ components and 70+ hooks

Open source libraries for rendering interactive vector maps


Open source reactive Python notebook stored as plain Python files

Free open source workspace for snippets, notes and API requests

Free, open source social network run by many independent servers

Markdown docs theme with built-in search and responsive layouts

React component library based on Google's Material Design


Self-hosted team chat for private, secure workplace messaging

Free open source marketing automation you can host yourself

Open source proof-of-work CAPTCHA that does not track users

Builds online books and guides from Markdown files, written in Rust


Self-hosted recipe manager with meal planning and shopping lists

Open source commerce engine for online stores and B2B sales

Open source search engine with instant results and hybrid AI search


Open source ELT platform that runs data pipelines as code

Memory layer that helps AI apps remember users across sessions

Simple open source in-memory cache for speeding up web apps



Open source dashboards and SQL queries for your database


Cloud native open source tool for API mocking and testing

JVM microservice framework with compile-time dependency injection

Plugin-driven WYSIWYG Markdown editor framework


Runs a small Kubernetes cluster on your own computer for testing


Free interactive HTTPS proxy to inspect and modify web traffic

Static site generator for project docs written in Markdown


Reactive state library that updates UI when tracked data changes


API mocking library for browser and Node.js


Mocking library built for Kotlin with coroutine support

Open source mock, proxy and recording server for HTTP and gRPC

Open standard for connecting AI apps to tools and data sources

Open model hub and Python library for AI models and datasets

Open source web application firewall engine used with OWASP rules

The code editor that powers VS Code, for web pages

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