The festvox project, based at Carnegie Mellon University, distributes documentation, scripts, and examples that should be sufficient for an interested person to build her own synthetic voices in currently supported languages or new languages in the University of Edinburgh's Festival Speech Synthesis System. The quality of the result depends much on the time and skill of the builder. For English, it may be possible to build a new voice in a couple of days' work; a new language may take months or years to build.
FF4L is a system for enhancing the GNU locate utility. It consists of a Linux kernel module and a couple of utilities that complement GNU locate. FF4L maintains a database file that logs all files created, so that locate can find files as soon as they are created instead of having to wait until the indexing utility is run.
fhttpd is an FTP/HTTP server with modules support. Modules run as separate "looping" processes locally or remotely, and can be configured to run under separate userids. Locally running modules can be configured to use fd passing of client's connection to avoid overhead in sending the response. ~username URL to directory remapping is supported in HTTP, and can be configured to access files, run scripts and modules under mapped user's userid.