Windows 7 and Windows 10 (and yes it is still pretty gross). At various times I have tried, oh boy have I tried, to have the linux on here. I also had a highly modified WIndows 8.1 for a few months.
When it comes to operating systems I really dunno what is gonna even be viable a year or two down the road let alone long term.
BTW, I did get a splash page up on BinOC and got the Interlink Add-ons Site going again after some modification to remove furry intellectual horseshit. I plan to write a whole new piece of PHP software to replace .. well everything I can. I want to have it do the website, project info and documentation, as well as add-ons in a singular unified way with more features to be decided. Additionally, I brought the ancient cross-reference crap back up as well.. It is just an aside, I am aware most couldn't care less but I thought I'd share anyway.
I DO want to state that when I get the tree building again the repository SHALL be made public and STAY that way. No more of this source code keepaway/dodgeball shit. I am gonna do things and whatever is open source STAYS open source and available. Plus it is ONE repo because there is zero need for the split comm/mozilla style setup anymore.