TuxGuitar

TuxGuitar is an open source software program written in Java. It is a tablature editor, score writer and player targeted at guitarists. Functions:

• Tablature editor
• Score Viewer
• Multitrack display
• Autoscroll while playing
• Note duration management
• Various effects (bend, slide, vibrato, hammer-on/pull-off)
• Support for triplets (5,6,7,9,10,11,12)
• Repeat open and close
• Time signature management
• Tempo management
• Imports and exports Guitar Pro .gp3, .gp4, .gp5 and Power Tab Editor .ptb files

Homepage: http://www.tuxguitar.com.ar

Traverso DAW

Is a GPL licensed, cross platform multitrack audio recording and editing suite, with an innovative and easy to master User Interface. It's suited for both the professional and home user, who needs a robust and solid DAW. Traverso is a complete solution from recording to CD Mastering. By supplying many common tools in one package, you don't have to learn how to use lots of applications with different user interfaces. This considerably lowers the learning curve, letting you get your audio processing work done faster!

Homepage: http://traverso-daw.org

Audacity

Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.

Homepage: http://audacity.sourceforge.net

WavePad

This audio editing software is a full featured professional sound editor for Windows or Mac. It lets you make and edit music, voice and other audio recordings. When editing audio files you can cut, copy and paste parts of recordings and, if required, add effects like echo, amplification and noise reduction. WavePad works as a wav editor or mp3 editor but it also supports a number of other file formats including vox, gsm, real audio, au, aif, flac, ogg and more.

Homepage: http://www.nch.com.au/wavepad/