These are not free but if you have them under windows, they work just fine in
WINE:
Tabledit, tabledit viewer (tablature editor and player, abc import, etc. -- A
good application.)
Abcmus (abc editor/player)
Harbal (Equalization to improve audio, compare to stuff you like--I was quite
surprized when this one played! Misidentifies the sound card but plays! The
only audio app so far I found usable and in real time yet.)
XGEdit (If you have an XG sound card, this one is handy. Caveat--the rightmost
column of button showing the voices does not appear because the author is
playing a few tricks, I suppose. Still usable to an extent, however.)
These are free:
AnalogX VPiano (computer keyboard plays MIDI. Could probably be of use using
jack if this works correctly in WINE).
DBPowerAmp music converter (Convert wav <--> MP3 -- works on right click or
standalone under Windows, standalone using WINE. Very useful!)