Audacity

Youtube videos by Ken Olson about the basics of Audacity and about label tracks, regions and markers.

Audio Timeliner a very nice (visualization) tool for musical analysis by annotating soundfiles. Made by Brent Yorgason of Brigham Young Universty.

Spotify

Quicktime

Finale

Quick start videos for Finale

Online tutorials for Finale

Sibelius

Sonic Visualiser

CMapTools

Adobe Reader