CTPL is a C template engine library allowing fast and easy computation of templates with precise control over the parsing environment.

This library contains functions commonly used by the CUPS filters in the OpenPrinting CUPS filters package, currently functions to read several different image formats and to convert bitmaps between different color spaces.

TSE3 is a portable open source MIDI sequencer engine written in C++. It provides programmers with rich and powerful sequencing capabilities. Although it does not provide a user interface, it provides a lot of assistance to a UI, attempting to provide as much functionality as possible in as generic a manner as possible.

This library contains functions for font embedding in PDF files, commonly used by CUPS filters.

tinyframe is a minimalistic library for reading and writing the Frame Streams protocol.

Fcitx is a input method framework with extension support, which provides an interface for entering characters of different scripts in applications using a variety of mapping systems.