Gravitation is a short, autobiographical pixelated art game by Jason Rohrer. It is a followup to his previous game, "Passage". It can be explored in approximately 8 minutes. If in doubt, please keep playing. If you still don't understand the game, please read the game creators statement on the website and the experiences of other people linked from the website.

The DjVu viewer djview4 (aka djview) is a simple multi-page viewer for DjVu-format documents. It can display, print, and save, and when supported by the document, search for text, copy text to the clipboard, follow links, etc.

GNU Solfege is an ear training program for X Windows written in Python, using the GTK+ 3.0 libraries. You can practice harmonic and melodic intervals, chords, scales and rhythms, and you can add new exercises using a simple plain text file format.

auralquiz is a music quiz game that scans a users selected folder of music and creates a quiz using the tags from the audio files. A sample of a random song is played and the player must answer a question about the sample from either multiple choice buttons or for hardcore difficulty, type in the correct answer. Up to 8 players can play in a turn based mode with scoring based on points, with more points given by answering the question faster.

g3data is used for extracting data from graphs. For example, graphs are typically published in scientific journals without tables of the actual data; g3data makes the process of extracting these data easy.