Here you go....http://agilescout.com/best-agile-scrum-tools/
reviews of tons of tools...some free, some not (I didn't read them, could be a fake site, but they at least listed a LOT of the tools out there)
We used to use xPlanner at my last startup (one of the free ones on the list)....worked fine when we were small, but outgrew it when the team hit around 50..probably outgrew it before then, but thats when it got painful and we switched. Based on the screen shot on the review site though looks like its had some major changes...
The dev team (which I'm no longer part of) now uses Version1. Its most certainly not free, but well we got acquired 6 years ago and now the company has 55,000 employees so that wasn't as much a concern anymore They seem to really like it and it integrates with lots of our other systems.
Bear in mind this is for Enterprise software, not games...but wouldn't think that would matter for a tool like this