Dosbox. The only ports I am aware of are for Windows CE (of all things), and Japanese PS1. Most remakes didn't really get anywhere, although I did make a full set of maps for UT you can mess around with.
I suggest running UW1 at 12500 cycles and UW2 at 20000 cycles. They can get a bit glitchy if they are running too fast. No idea what the default settings are if you get them from GoG.