One of the main limitations of Windows RT is that most 32- and 64-bit applications aren't compatible. Therefore, if you are buying a Microsoft Surface and intend to install all your favorite Windows programs, then you're going to have a bad time. To remedy this issue, XDA Recognized Developer GoodDayToDie has begun an initiative to get some desktop apps compiled for RT users.
So far the initiative has gotten attention from a number of users and developers. To begin with, everyone has been focusing on re-compiling free, open source software to work on Windows RT. Here is the current list of applications that have been ported already: