I found out about this when installing Synergy on my fresh Windows box that I use mostly for gaming. I gladly coughed up the $5. Of course, I could have built the software myself but, it wasn't worth the hassle of recompiling on all my platforms and keeping the software up to date. I think this model of open source software makes quite a bit of sense. I hope they get enough funding from this to keep making Synergy... It is a very useful tool.