Giada is a minimal, hardcore audio tool for DJs and live performers. Just pick your sample, drop it in any channel, and start the show by using this tiny piece of software as a loop machine, drum machine, sequencer, live sampler, or effect (VST) host. Giada aims to be a compact and portable virtual device for production use and live sets.
FF Multi Converter is a simple graphical application that converts audio, video, image, and document files between all popular formats, using and combining other programs. It uses ffmpeg for audio/video files, unoconv for document files, and the ImageMagick library for image file conversions.
cwwav takes one or more text files (or text read from standard input) and converts the text into an audio file (wav or mp3) containing the CW (Morse code) representation of the text. It's useful for generating practice files if you are learning CW and want to practice by listening to text. It's a very simple program but it is designed to do what it does well. That is, it is designed to produce good sounding CW output files, with proper timing and comfortable envelope to avoid keyclicks and to make the CW softer.
Potamus is a lightweight GTK+-based audio player with a simple interface and an emphasis on high audio quality. It tries to make it as easy as possible to use your file manager to locate and play music. Potamus can play a wide range of audio formats, works with ALSA, JACK,and other audio systems, and supports 24-bit audio and gapless playback.
Pogo is probably the simplest and fastest audio player for Linux. Its elementary-inspired design uses the screen-space very efficiently. Pogo is especially well-suited for people who organize their music by albums on the hard drive. The main interface components are a directory tree and a playlist that groups albums in an innovative way.