OCaml is an implementation of the ML language, based on the Caml Light dialect extended with a complete class-based object system and a powerful module system in the style of Standard ML.

SMPEG (SDL MPEG Player Library) is a free MPEG1 video player library with sound support. Video playback is based on the ubiquitous Berkeley MPEG player, mpeg_play v2.2. Audio is played through a slightly modified mpegsound library, part of splay v0.8.2. SMPEG supports MPEG audio (MP3), MPEG-1 video, and MPEG system streams.

Snapper is a tool for Linux filesystem snapshot management. Apart from the obvious creation and deletion of snapshots, it can compare snapshots and revert differences between snapshots. In simple terms, this allows root and non-root users to view older versions of files and revert changes.

The Sound Object Library is an object-oriented audio processing library. It provides objects for synthesis and processing of sound that can be used to build applications for computer-generated music.

Sofia-SIP is an open-source SIP User-Agent library, compliant with the IETF RFC3261 specification. It can be used as a building block for SIP client software for uses such as VoIP, IM, and many other real-time and person-to-person communication services.

Libwebsockets is a lightweight pure C library for both websockets clients and servers built to use minimal CPU and memory resources and provide fast throughput in both directions.