Wavosaur is an intuitive application that offers users the ability to easily load audio files (MP3, WAV, AIFF and more) and edit them. It is a freeware audio editing application that's light on system resources, helpful and portable.
Here are some screenshots to illustrate the features and user interface of this application:
Aegisub
Cakewalk
ocenaudio
Sofeh Music Studio
HitFilm Express