Open source. Open possibilities.

SQLFluff is a modular, dialect-flexible SQL linter and auto-formatter that auto-fixes most linting errors and works with Jinja and dbt templating for ELT workflows.

Checkstyle is a Java development tool that helps programmers write code adhering to coding standards. It supports Google Java Style and Sun Conventions, is highly configurable, and integrates with build tools like Maven and Ant.

fd is a fast, user-friendly alternative to the 'find' command for locating entries in your filesystem.

Sentry is a developer-first debugging platform for error tracking and performance monitoring, with official SDKs for many languages and frameworks.

SwiftLint is a widely-used open-source linter for Swift code that enforces style and conventions with over 200 configurable rules, integrating with Xcode, VS Code, CI pipelines, and more.

Trivy is a comprehensive security scanner used to detect vulnerabilities, misconfigurations, secrets, and SBOMs across various targets including containers, Kubernetes, and code repositories.

A curated collection of Web Application Security payloads and bypasses for pentesting and CTFs, covering vulnerability descriptions, exploitation techniques, and Burp Intruder file sets.

Template-driven vulnerability scanner with a YAML DSL, community templates, and support for HTTP, DNS, TCP, SSL, WHOIS, JavaScript, headless browser, fuzzing, CI/CD integration, and multiple report formats.

Backtesting.py is a Python library for backtesting trading strategies. It offers a simple API, fast execution, a built-in optimizer, composable base strategies, and interactive visualizations for analyzing OHLC(V) financial data.

A comprehensive collection of various algorithms implemented in Python, designed specifically for educational and learning purposes.

Official Sentry SDKs for JavaScript provide error tracking across browsers, Node.js, and frameworks like React, Angular, and Vue. Install via npm/yarn, initialize with a DSN, and capture errors and messages for application monitoring.

Metasploit Framework is an open-source penetration testing tool under a BSD-style license. It provides msfconsole, module APIs, installers for Linux/macOS, and documentation for development, usage and contribution.

Jaeger is a CNCF-graduated distributed tracing platform for collecting, storing and visualising traces across microservices. It speaks OTLP, ships with a UI, collector and query service, and supports pluggable storage backends.

Memray is a Python memory profiler that tracks allocations in Python, native extensions, and the interpreter. It generates reports like flame graphs, supports threads and native code, and works on Linux/macOS.

pytest is a Python testing framework that simplifies writing small tests and scales to complex functional testing. It features detailed assertion introspection, auto-discovery of tests, modular fixtures, and compatibility with unittest.

Grafana Pyroscope is a continuous profiling platform that surfaces performance insights from your applications, helping you optimize CPU, memory and I/O usage and debug bottlenecks down to a single line of code.

Gitleaks is an open-source secret detection tool for scanning git repositories, directories, files and stdin for passwords, API keys and tokens, with pre-commit hook and CI action integrations.

Compiler Explorer is an interactive web tool for compiling code in C, C++, Rust, Go and 30+ other languages and viewing the resulting assembly in real time. It supports multiple compilers per language, configurable layouts and a REST API, and can be self-hosted.

RetroChess is a Chess plugin for RetroShare 0.6 that lets you play chess with RetroShare friends and contacts. It installs as a shared-library extension and adds a chess game window plus chat invitations, and ships with a standalone Qt board debugger for testing chess rules.

Ruffle is an Adobe Flash Player emulator written in Rust, targeting desktop and web via WebAssembly. It supports ActionScript 1, 2 and 3, and offers desktop builds, browser extensions, a web demo, plus scanner and exporter utilities.