EKO is small and simple sound editor based on Qt4/5, Portaudio, libsndfile and libsamplerate. It has basic editing, utility and analysis functions, the rack with realtime effects (not so much), GUI themes and palettes support.
Beast is a music composition and modular synthesis application. As input methods, it offers a multitrack editor, a piano roll, and supports pattern editing. It has a wide range of technical abilities like sequencing, unlimited undo/redo history, real-time synthesis with multiprocessor support, full duplex 32-bit audio rendering, seeking at sample granularity, on demand loading of partial wave files, on the fly decoding of various sample formats, aliasing free oscillators, and full scripting supp
cdrtools (formerly cdrecord) creates home-burned CDs/DVDs with a CDR/CDRW/DVD/BluRay recorder. It works as a burn engine for several applications. It supports CD/DVD/BD recorders from many different vendors; all SCSI-3/mmc- and ATAPI/mmc-compliant drives should also work. Supported features include IDE/ATAPI, parallel port, and SCSI drives; audio CDs, data CDs, and mixed CDs; full multi-session support; CD-RWs, DVD-R/-RW, DVD+R/+RW, BD-R/BD-RE; and TAO, DAO, RAW, and human-readable error message
The Advanced Linux Sound Architecture (ALSA) provides audio and MIDI functionality to the Linux operating system. ALSA has the following significant features: Efficient support for all types of audio interfaces, from consumer sound cards to professional multichannel audio interfaces. Fully modularized sound drivers. SMP and thread-safe design. User space library (alsa-lib) to simplify application programming and provide higher level functionality. Support for the older Open
PlayShell is a simple console-based application for playing media files in Linux using known media players like SoX, VLC, MPlayer and FFplay as backend.
GNU Solfege is *free* ear training software written in Python 3.4 using the Gtk+ 3 toolkit. The program is designed to be easily extended with lesson files (data files), so the user can create new exercises.