Creative WaveStudio is a useful tool that was designed in order to provide you with all the tools you'll need to play, edit, and record 8-bit (tape quality), 16-bit (CD quality) and 24-bit wave data. It is a freeware audio editing application that's comprehensive and user friendly.
Here are some screenshots to illustrate the features and user interface of this application:
Aegisub
Cakewalk
ocenaudio
Sofeh Music Studio
HitFilm Express