CodeWeavers are giving away a free licence for CrossOver tomorrow (31 Oct in GMT-5, so probably some time in the afternoon for us). For those who don't know what it is, it lets you run some Windows applications on Linux/OSX. I used to use it for TF2 before it was ported. I'll probably use it this time to run The Ship and Shank from Steam since the OSX version of that is borked.
Here's their compatibility list: http://www.codeweavers.com/compatibility/
More info about why they're giving it away here:
http://www.codeweavers.com/about/general/press/20121029/
How is this any different to the free and open source wine application layer for Linux?