Libcwd is a full-featured and well-documented library that assists C++ developers with debugging their applications. It includes support for ostream-based debug output, custom debug channels and devices, memory allocation debugging, run-time sourcefile:linenumber information, and demangled type names of variables. It is thread-safe.
Objective Caml is the latest implementation of the Caml dialect of ML. It has full support for objects and classes combined with ML-style type reconstruction, a powerful module calculus in the style of Standard ML (but retaining separate compilation), a high-performance native code compiler (in addition to a Caml Light-style bytecode compiler), and labeled arguments with possible default value.
Prototype Makefiles allows for very fast project startups; often no editing of Makefiles is needed at all. It is a collection of shared Makefiles and Makefile templates. The shared Makefiles contain the rules for building a project, cleaning it and making dependencies etc. The Makefile templates contain the data that is specific for each project. This separation avoids duplication of code in Makefiles and is therefore extremely easy to maintain and extend.
The Qt XInput Extension is a C library adding support for XInput devices (like tablets or joysticks) to Qt-based X11 applications. QXi supports devices with up to six valuator axes in absolute mode, up to 32 buttons, and any number of keys. It is built using autoconf and libtool, and comes with a simple example application.