Everybody needs to go TuxGuitar. TuxGuitar is one of the penguin themed applications for Linux that has Mac, PC, and FreeBSD ports. TuxGuitar uses Tux Tab files but can also play and edit PowerTab and Guitar Pro 2-5 Tabs! I've gone back and downloaded all of the Guitar Pro tabs that I used to not be able to use because I didn't purchase Guitar Pro!!

Oh! I almost forgot the best part. . . IT'S ENTIRELY FREE!!
While this guy does seem like a tool Tux Guitar is nice. Its not great for writing tabs but Its awesome if you just need to open guitarpro files without buying it.

Ease up on the huge font, makes it seem like your screaming your balls off at us.
Guitar Pro is still infinitely better. Also, use your inside voice
ohai little sig.