yodl implements a pre-document language and tools to process it. It lets you write a single document, then use a tool (e.g., yodl2html) to convert it to some final document language (HTML, man, LaTeX, etc.). Yodl's document language is easy to use and to expand. Predefined converters are available from Yodl to HTML, LaTeX, groff (manpages), text, and (experimentally) XML, but new converters can be added easily.
yuck is a command line option parser for C that works on a minimal set of dependencies - only a C compiler and the m4 macro processor are required. It supports all the standard use cases: GNU-style long options (--option), condensable short options (-xab for -x -a -b), and optional arguments to long and short options (--foo[=BAR]), multiple occurrence of options (-vvv). Most importantly, it does not depend on libc's getopt() nor getopt_long().
Yxorp is a reverse proxy for HTTP. All the fields in requests can be checked and modified by rules. Load balancing, virtual hosting, multiple TCP ports, and SSL are supported. The configuration can be modified on-line. Yxorp can be used to protect Web sites, place pages behind a login, rewrite URLs, etc.
Z80~Ex is a portable ZiLOG Z80 CPU emulator designed as a library. Goals include precise opcode emulation (documented and undocumented), exact timings for each opcode (including I/O operations), and ability to emulate several virtual CPUs simultaneously. A Z80 code dissasembler is also included.