Qsynth is a GUI front-end application for Fluidsynth. Fluidsynth is a command-line software synthesizer based on the Soundfont specification. Qsynth was built with the Qt4 toolkit using Qt Designer. Eventually it may evolve into a softsynth management application that allows the user to control and manage a variety of command line softsynths, but it currently just wraps the excellent Fluidsynth program.
somaplayer is music player for MP3, Ogg, wav, audio CDs, MP3 streams, and Ogg streams. It is able to use the appropriate sound drivers or demons or to stream directly to an Icecast server (Icecast2 or SHOUTcast) or to encode in MP3 and Ogg Vorbis. It also acts as a sound daemon that is able to accept connections from other somaplayers or any other sound player (xmms, mpg123, and others) thanks to a special wrapper.
Soundtank is a program that hosts musical instruments for you to play; each instrument can be controlled via MIDI. You can create custom instruments and save them to files, and can also load instruments that other people create. It relies on LADSA plugins, as it has no built-in sound synthesis algorithms, but hosts them in "realtime objects" which embody the structure of the audio signal flow. RTObjects can be controlled in a completely customizable fashion using MIDI events sent through the ALSA sequencer interface. Soundtank outputs audio through ALSA or JACK.
Transcend can best be described as retro-style, abstract, 2D shooter. The graphics are geometrical, and the pace is sometimes frenzied. Two features set Transcend apart from other games. First, its dynamic graphical engine, which can smoothly morph from one complex shape to another in realtime, produces striking displays. Combining these dynamic shapes with subtle randomizations ensures that each new play through a level is visually different from the last. The second novel feature is the musical power-up system. As you play through a level, you are simultaneously assembling an abstract visual collage and arranging a unique piece of music.