There is a project on GitHub since July 2014 to develop a new version of Power Tab from the scratch, called PowerTab 2.0. It's a cross-platform (Windows, Linux, OS X) open-source solution. This new version can read the old PowerTab 1.7 files as well as Guitar Pro files. A main change is that guitar and bass score are now in the same window. Currently (March 2021) the Alpha 14 version is published resp. .
