Open source. Open possibilities.

Cython is an optimizing Python compiler that translates Python code into C/C++ to create efficient extensions.

Locust is an open-source load testing tool that lets you write tests in plain Python. It supports distributed testing, real-time web UI, and can test any system via custom clients.

pprof is an open-source profiling data visualization and analysis tool that reads profile.proto format data, generates text and graphical reports, and supports interactive analysis through CLI and web interfaces.

Apache TVM is an open machine learning compilation framework designed for universal deployment and customizable compiler pipelines.

Nuitka is a Python compiler that translates Python code into C, producing standalone executables or extension modules. Compatible with Python 2.6-2.7 and 3.4-3.14, it works across Linux, macOS, and Windows. Supports multiple compilation modes including standalone distribution.

Fastify is a fast, low-overhead web framework for Node.js with a powerful plugin architecture, JSON Schema-based validation and serialization, and built-in Pino logging. It is extensible via hooks, plugins and decorators, and is maintained as an OpenJS Foundation project.

A complete, serverless and distributed load testing platform for production-grade performance testing of APIs and browser-based workflows.

Bundlephobia helps developers assess the bundle-size impact of adding npm packages to frontend applications.

Solid is a declarative JavaScript library for building user interfaces, compiling JSX templates to real DOM nodes and updating them with fine-grained reactive primitives instead of a virtual DOM.

optimizerDuck is a free, open-source Windows optimization tool for performance, privacy, and simplicity. It offers 42 tweaks, 44 customization settings, and built-in tools like startup manager and disk cleanup, with automatic backups and one-click revert.

immudb is an open-source immutable database with built-in cryptographic proof and verification. It supports SQL, key-value, and document models, keeps a tamper-proof history of every change, and speaks the PostgreSQL wire protocol.

VMNL is an experimental, low-level Rust library built on Vulkan, providing a modular foundation for graphics, audio, and networking for game engines and real-time applications.

react-native-graph is a React Native line graph component built on Skia, designed for smooth, animated charts in mobile apps. It offers pan scrubbing, gradient fills, axis labels, selection dots, and a static renderer for list views.

WebdriverIO is a next-gen browser and mobile automation test framework for Node.js, supporting WebDriver, WebDriver BiDi, and Appium protocols for end-to-end, unit, and component testing.

Gin is a high-performance HTTP web framework for Go, featuring a Martini-like API with significantly better performance. It provides zero-allocation routing, middleware support, JSON validation, route grouping, and built-in error management for building REST APIs and microservices.

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.

Fiber is an Express-inspired Go web framework built on Fasthttp, offering routing, middleware, static file serving, WebSocket and SSE support with a focus on performance and low memory use.

Apache JMeter is an open-source Java application for load testing and performance measurement of various services, supporting multiple protocols, a GUI IDE, command-line mode, and dynamic HTML reporting.