A collective list of free APIs

📚 Freely available programming books

Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.

AutoGPT is the vision of accessible AI for everyone, to use and to build on. Our mission is to provide the tools, so that you can focus on what matters.

Langflow is a powerful tool for building and deploying AI-powered agents and workflows.

A feature-rich command-line audio/video downloader

Magnificent app which corrects your previous console command.

Collection of awesome LLM apps with AI Agents and RAG using OpenAI, Anthropic, Gemini and opensource models.

A list of useful payloads and bypass for Web Application Security and Pentest/CTF

Drop in a screenshot and convert it to clean code (HTML/Tailwind/React/Vue)

Hunt down social media accounts by username across social networks

RAGFlow is a leading open-source Retrieval-Augmented Generation (RAG) engine that fuses cutting-edge RAG with Agent capabilities to create a superior context layer for LLMs

The official gpt4free repository | various collection of powerful language models | o4, o3 and deepseek r1, gpt-4.1, gemini 2.5

🌟 The Multi-Agent Framework: First AI Software Company, Towards Natural Language Programming

CLI platform to experiment with codegen. Precursor to: https://lovable.dev

Odoo. Open Source Apps To Grow Your Business.

The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data.

An interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.

aider is AI pair programming in your terminal

Certbot is EFF's tool to obtain certs from Let's Encrypt and (optionally) auto-enable HTTPS on your server. It can also act as a client for any other CA that uses the ACME protocol.

The OWASP Cheat Sheet Series was created to provide a concise collection of high value information on specific application security topics.

Glances an Eye on your system. A top/htop alternative for GNU/Linux, BSD, Mac OS and Windows operating systems.

🦔 PostHog is an all-in-one developer platform for building successful products. We offer product analytics, web analytics, session replay, error tracking, feature flags, experimentation, surveys, d…

Set up a personal VPN in the cloud

A modular graph-based Retrieval-Augmented Generation (RAG) system

🔒 Consolidating and extending hosts files from several well-curated sources. Optionally pick extensions for porn, social media, and other categories.

Best and simplest tool for website change detection, web page monitoring, and website change alerts. Perfect for tracking content changes, price drops, restock alerts, and website defacement monito…

[EMNLP2025] "LightRAG: Simple and Fast Retrieval-Augmented Generation"

get things from one computer to another, safely

Prefect is a workflow orchestration framework for building resilient data pipelines in Python.