Grf-extractor
This is a command line tool GRF extractor, written in Javascript, using roBrowser's standard grf libraries.
You will need to have Node.js installed to run this tool. Once installed, you can easily install it with the npm (node package manager).
Once npm is installed, run this command on your shell/terminal.
$ npm install -g grf-extractor #Install
$ grf-extractor -h # Usage guide
$ grf-extrator -g data.grf # Extract the entire grf to the current folder
Npm: https://www.npmjs.org/package/grf-extractor
Git: https://github.com/herenow/grf-extractor
Not sure how its performance compares to the standard grf C libraries, would be nice if someone compared it
There are still some stuff todo, and please report any bugs or performance issues.