Guitar/bass tablature editor
Tablatures is a tablature editor for Mac OS X.
Tablatures is compatible with PowerTab, which is a well-known and widely adopted tablature editor for Windows systems. Thus you can share your music even with those members of your band that don't own a Mac! Moreover, you can easily find thousands of song transcriptions in this format on the net. Tablature can open most Guitar Pro 3-5 files too.
With Tablatures you can also export your tabs in MIDI format, or follow the playback on screen to help your learning process.