Grip is a CD player and CD ripper/MP3-encoder for the GNOME desktop. It has the ripping capabilities of cdparanoia built in, but can also use external rippers (such as cdda2wav). It also provides an automated frontend for MP3 encoders (presets for lame, bladeenc, l3enc, xingmp3enc, mp3encode, and gogo), letting you take a disc and transform it easily straight into MP3s. The Ogg Vorbis format is also supported. Internet disc lookups are supported for retrieving track information from disc database servers. Grip works with DigitalDJ to provide a unified, "computerized" version of your music collection.
gRio500 is a Gnome/GTK program that lets you interface with the Rio500 MP3 player by Diamond/S3/SonicBlue. You can currently create/delete folders, add/delete songs, format memory, rename folders/songs, automatically downmix/resample MP3s during transfer, and preview MP3s (play/stop controls). You can interface with both internal and external memory (Smartmedia).
Griffon is a GTK+ GUI cryptanalysis tools package for pre-digital ciphers. All monoalphabetic transposistion and substitution ciphers are covered, including multi-char ciphers such as Playfair. The toolset includes a customizable frequency count, substitution list, cribbing of ciphers, and a notepad to record your attempts.
Gri is an extensible plotting program designed for scientists. It can draw x-y plots, contour plots, and image plots, and has rudimentary programming capabilities. Output is PostScript. Gri is not mouse driven, nor GUI-based; it is a language. Users regard it as an analogue to the LaTeX document formatting language: users gain considerable power, at the price of a moderate learning curve.