I like PolyOS.Most of the time my projects are PolyOS and if you have seen many of my projects you will notice I love PolyOS 5, its just very cool. PolyOS 6 is also cool but my personal fav is PolyOS5

fav was shorten because i was running out of letters.
Im curently Working on ScratchyVM A PolyOS app that lets you run Virtual Machines. I like OS'es and i play with them most of the time.