For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.

Open-source KVM software

Cross-platform asynchronous I/O

⚡ KCP - A Fast and Reliable ARQ Protocol

memcached development tree

A lightweight online game framework

Event notification library

Native port of Redis for Windows. Redis is an in-memory database that persists on disk. The data model is key-value, but many different kind of values are supported: Strings, Lists, Sets, Sorted Se…

xv6 OS

http://torch.ch

Disque is a distributed message broker

mGBA Game Boy Advance Emulator

nanomsg library

High Performance TCP/UDP/HTTP Communication Component

A MMOG engine of server.

Small portable AES128/192/256 in C

nanomsg-next-generation -- light-weight brokerless messaging

RTSP/RTP/RTMP/FLV/HLS/MPEG-TS/MPEG-PS/MPEG-DASH/MP4/fMP4/MKV/WebM

C library for encoding, decoding and manipulating JSON data

https://github.com/json-c/json-c is the official code repository for json-c. See the wiki for release tarballs for download. API docs at http://json-c.github.io/json-c/

GPAC Ultramedia OSS for Video Streaming & Next-Gen Multimedia Transcoding, Packaging & Delivery

ENet reliable UDP networking library

Read-only mirror of official repo on openldap.org. Issues and pull requests here are ignored. Use OpenLDAP ITS for issues.

Memory Debugger for Windows, Linux, Mac, and Android

A reliable, high-performance, thread safe, flexsible, clear-model, pure C logging library.

PortAudio is a cross-platform, open-source C language library for real-time audio input and output.

Basic implementations of standard cryptography algorithms, like AES and SHA-1.

3D Maps & Terrain SDK (C++)

UPnP IGD implementation

ANSI C library for NURBS, B-Splines, and Bézier curves with interfaces for C++, C#, D, Go, Java, Javascript, Lua, Octave, PHP, Python, R, and Ruby.