Cpp GitHub Repositories (2026) · Open Source Tools

A small, dependency-free node editor for dear imgui

Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum

A modern open source rendering engine for animation and visual effects

The fastest unified streaming SQL Engine in a single C++ binary. ⚡ Millisecond latency. 100+ GB/s throughput. Continuously compute stateful context from streams, logs, metrics, events, and CDC.

Cista is a simple, high-performance, zero-copy C++ serialization & reflection library.

Turn dials. Summon bangers! NOW WITH MORE C++! Local AI music generation powered by GGML

Apache TsFile

A header-only C++ argument parser library. Supposed to be flexible and powerful, and attempts to be compatible with the functionality of the Python standard argparse library (though not necessarily the API).

Speech synthesis, speech recognition and voice activity detection for voice conversation, in C++ on ggml: Qwen3-TTS, Irodori-TTS, Qwen3-ASR, ReazonSpeech, parakeet and Silero VAD on Metal, Vulkan and the CPU, with an OpenAI-compatible server and live transcription.

Pluggable in-process caching engine to build and scale high performance services

The Domain-Correct Quantities and Units Library for C++ — full quantity kind safety, ISO 80000 compliant, C++29 standardization candidate.

Framework for building trading systems

Easy to use C++17 HTTP Server with no compromise on performances. https://matt-42.github.io/lithium

Expressive Vector Engine - SIMD in C++ Goes Brrrr

Smith is a high order nonlinear thermomechanical simulation code

Native amateur-radio workstation for FlexRadio (FLEX-6000/8000/Aurora) — Linux, macOS, Windows · Qt6 + C++20

Probably the fastest coroutine lib in the world!

llama.cpp (GGUF LLMs) and llava.cpp (GGUF VLMs) for ROS 2

A Modern C++ Text-Based Widget Toolkit (TUI)

Free open-source modern C++20/23 framework to create console (CLI), forms (GUI like WinForms) and unit test (xUnit) applications and libraries on Windows, macOS, Linux, iOS, Android, FreeBSD, Haiku, and SerenityOS.