TuxGuitar is an exellent piece of software I recently discovered.
It is completely open-source and reads and creates Guitar Tablature files. It even is compatible with the file format used by the commercial software Guitar Pro 5, allowing it to read and write to files that software can understand.
It’s the perfect solution to get those song ideas that are stuck in your head onto paper so you don’t lose them.
Also, if you ever go on www.ultimate-guitar.com and see Guitar Pro tabs, then this can read them, so you can read the tab as the song is playing.
Download it Now! and give it a try.