C++

language-extlouthy/language-ext

A C# functional programming framework that provides monads, immutable collections, effects, and concurrency tools to write declarative, robust code.

Flax EngineFlaxEngine/FlaxEngine

A high-quality modern 3D game engine written in C++ and C# with a focus on fast workflow and stunning graphics.

mbedTLSARMmbed/mbedtls

A portable C library implementing TLS/DTLS protocols and X.509 certificate handling for embedded systems and general applications.

MTProxyTelegramMessenger/MTProxy

A simple MTProto proxy server that enables Telegram access in censored regions.

The Battle for Wesnothwesnoth/wesnoth

An open-source, turn-based tactical strategy game with a high fantasy theme, featuring singleplayer campaigns and multiplayer combat.

HAProxyhaproxy/haproxy

A free, very fast, and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.

cxxdtolnay/cxx

A safe, zero-overhead FFI bridge for calling C++ code from Rust and Rust code from C++.

Sysbenchakopytov/sysbench

A scriptable multi-threaded benchmark tool for databases and systems based on LuaJIT.

MessagePack-CSharpneuecc/MessagePack-CSharp

Extremely fast MessagePack binary serializer for C# with LZ4 compression, optimized for .NET, Unity, and Xamarin.

cppcheckdanmar/cppcheck

A static analysis tool for detecting bugs and undefined behavior in C and C++ code.

Hiredisredis/hiredis

A minimalistic C client library for Redis, featuring synchronous, asynchronous, and reply parsing APIs.

FasterMicrosoft/FASTER

A high-performance concurrent persistent recoverable log and key-value store + cache for large application state, in C# and C++.

Lib.Harmonypardeike/Harmony

A library for patching, replacing, and decorating .NET and Mono methods during runtime, enabling non-destructive code modifications.

Hazelcasthazelcast/hazelcast

A unified real-time data platform combining stream processing with a fast data store for instant action on data-in-motion.

Snappygoogle/snappy

A fast compression/decompression library optimized for speed over maximum compression.

OpenMWOpenMW/openmw

An open-source game engine for playing and modding The Elder Scrolls III: Morrowind with modern enhancements.

H3jsuber/h3

A hexagonal hierarchical geospatial indexing system for efficient spatial analysis and visualization.

http-parsernodejs/http-parser

A high-performance, lightweight HTTP message parser written in C for requests and responses.

Wav2Letter++facebookresearch/wav2letter

Facebook AI Research's automatic speech recognition toolkit for end-to-end ASR with modern neural architectures.

wav2letterfacebookresearch/wav2letter

A high-performance automatic speech recognition toolkit from Facebook AI Research, built with fully convolutional neural networks.

BLAKE3BLAKE3-team/BLAKE3

A cryptographic hash function that is significantly faster than SHA-256, highly parallelizable, and serves as a PRF, MAC, KDF, and XOF.

Cavakarlstav/cava

A cross-platform bar spectrum audio visualizer for terminal and desktop environments.

NuPicnumenta/nupic

An open-source implementation of Hierarchical Temporal Memory (HTM) for anomaly detection and prediction of streaming data.

TagUI (.2k)aisingapore/TagUI

An open-source RPA tool that automates repetitive tasks on websites, desktop apps, and the command line using a simple language.

nanomsgnanomsg/nanomsg

A high-performance implementation of lightweight messaging scalability protocols for common communication patterns.

grblgrbl/grbl

An embedded, high-performance G-code parser and CNC milling controller for Arduino that replaces parallel-port motion control.

Statelessdotnet-state-machine/stateless

A simple .NET library for creating state machines and lightweight state machine-based workflows directly in C# code.

cmuscmus/cmus

A small, fast, and powerful console music player for Unix-like operating systems.

NAudionaudio/NAudio

A comprehensive .NET audio library for playback, recording, format conversion, MIDI, and audio manipulation.

Duktapesvaarala/duktape

An embeddable, portable JavaScript engine with a compact footprint, designed for integration into C/C++ projects.

implotepezent/implot

An immediate mode, GPU-accelerated plotting library for Dear ImGui, designed for real-time data visualization.

ios-webkit-debug-proxygoogle/ios-webkit-debug-proxy

A proxy that enables Chrome DevTools Protocol debugging for Safari and WebViews on iOS devices and simulators.

Ant Design Blazorant-design-blazor/ant-design-blazor

A rich set of enterprise-class UI components for Blazor based on Ant Design.

algorithms_and_data_structuresmandliya/algorithms_and_data_structures

A collection of 180+ algorithm and data structure problems implemented in C++ and Python for learning and interview preparation.

yaml-cppjbeder/yaml-cpp

A YAML 1.2 compliant parser and emitter library for C++.

OpenH264cisco/openh264

An open-source H.264 codec library for real-time video encoding and decoding, widely used in WebRTC applications.