Hodie prints the current date and time to stdout in Roman numerals, with grammatically correct Latin. Complete with Id., Kal., Non., pridie, postridie, bis, and all the other nice annoyances. As an option, it even provides you with current date according to Roman calendar -- that is 'ab urbe condita'; after Rome was built.
Traduki is a free machine translation system written in C/Lua. It works by creating an interlinguistic representation of text in Lua tables, the representation being somewhat modelled on the generative grammar of Noam Chomsky. Traduki aims to feature support for less common languages.
GPLIGC is a program for analyzing IGC flight data from GNSS flight data recorders used by glider pilots. It uses Perl/Tk and gnuplot. The openGLIGCexplorer (written in C++) allows one to view the data in 3D with OpenGL, and can also be used as a digital elevation model terrain viewer. It can also be used for off-screen rendering of 2D and 3D images of flight tracks or terrain/map data.
GNotary is a set of Python scripts that implement an asynchronous digital notary service. Anybody who needs certification of any digital document creates a message digest (like MD5 or RIPEMD160) of that document and submits it to the GNotary service by email. GNotary signs this email digitally (using GnuPG), retains a copy of the certified and time stamped message, and mails it back to the sender, optionally with the public key attached to allow the sender to verify the signed document. At regular intervals, the GNotary server creates message digests of its own logs and distributes them among other GNotary servers, thus making it virtually impossible to forge the chain of evidence that authenticates a submitted document.
Snow Path Formation Simulator is a program that models the process of people forming very distinct, and yet not always altogether logical looking, paths in the snow as they walk across open spaces. The evolving condition of the snow is displayed graphically. This project may eventually mature into a screensaver.
Gpsdrive is a map-based navigation system. It displays your position on a zoomable map provided from a NMEA-capable GPS receiver. The maps are autoselected for the best resolution, depending of your position, and the displayed image can be zoomed. Maps can be downloaded from the Internet with one mouse click. The program provides information about speed, direction, bearing, arrival time, actual position, and target position. Speech output is also available.
Cyberbrau is a Web-based program to help the homebrewer. It allows for very simple and intuitive beer, cider, and mead recipe creation, and it automatically calculates all the pertinent information based on the selected ingredients and schedule. In addition to the recipes, it allows multiple brewers to privately track their own batches, emailing them on racking, bottling, and lagering dates. Finally, it has a 'taster's review' section which allows those who try your brew to rate and comment on the batch. This information goes into the overall recipe ranking.