GramoFile is intended primarily for transferring gramophone records to CDs, but has many other possible uses. It can record very long .wav files with a bargraph signal peak-level meter, playback any part of the files, split long .wav files into separate tracks (with automatic track location), and process the signal with filters to reduce ticks and pops (multiple filters are provided, they can be applied in any order (multiple instances) with user-adjustable parameters). Track splitting and signal processing are done in the same run, and don't need any temporary files.
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).
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.
Gronk is a Web-based MP3 jukebox. It generates heavily-hyperlinked Web pages listing all of your ripped CDs, by extracting information from CDDB data. These Web pages allow easy selection of songs or albums to play, and when nothing has been explicitly selected, it selects songs randomly. Playback is done via either XMMS or mpg123.
GSI is an easy-to-use network audio system that gives applications, through a very simple API, sample playing with stereo, 3D, doppler effects, music playing (MIDI, HMP, MUS), and CD playing and ejecting/changing. GSI also contains a separately usable sound/music loading/saving/format conversion library libgsif, although saving/format conversion is not completely done. It is known to run on Linux, OpenBSD, and FreeBSD, with support for /dev/audio (8000Hz mono mulaw), OSS, ultrasound project drivers, and FreeBSD's pcm system (from 0.9.4 on).