SLiMTAB is a brand new guitar tab editor. And it is open source.
SLiMTab requires Node.js to run.
Install the dependencies and devDependencies and start.
$ git clone https://github.com/tim37021/SLiMTAB
$ cd SLiMTAB
$ npm install
$ git clone https://github.com/ps2747/SLiMTAB-backend
$ npm start