I am currently doing a bit of work on Ubuntu
, to be more precise on their just released version 14.04 LTS. It was quite a pleasure installing it, much has changed since I tried my first Linux distribution (I think it was Suse 7.0 back in 2000). It also works perfectly with all my exotic hardware, to my surprise. I am used to have to spend days searching through web forums for the right configuration file change or shell command to make everything work correctly, but this time everything worked. Cool.
I'm not sure how popular Linux is, and if users on there are also paying for software (I don't think so), but it maybe would be an idea to port some of my software to that platform as well.