That look promising. I have to wonder if that other "GPL" version is even legal. The restrictions placed on the code by rar labs would seem to indicate that the GPL license invalidates.
For those who don't know, the issue with the unrar is that it's restricted that you aren't allowed to use it's code to try and create a new version of a program to create rar files. This code is issued under the GPL with this restriction. But under section 7 of the GPLv2:
If you cannot distribute so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not distribute the Program at all.
And seeing as the rar condition prevents you from exercising the following clause from second 2 under the GPLv2:
you may modify your copy or copies of the Program or any portion of it, thus forming a work based on the Program, and copy and distribute such modifications or work under the terms of Section 1 above, provided that you also meet all of these conditions:
Thus while I'm not a lawyer, I would say the non-Free unrar is not legal to distribute. So I hope this new project comes along nicely.