Non-League free game recommendations?

I've been having issues with my ISP, some RL stuff, and a streak of just very negative games where the only common denominator is me. Rather than getting frustrated and probably wind up getting banned (I've been a bit more... vocal than I usually am), I thought I'd get some other game thoughts.

We're pretty broke atm, and with our ISP issues I'd prefer to not play a persistent online game-- at least not one where a disconnect would negatively impact other players. So any games you guys have enjoyed lately that I could download, emulate (wihout extra peripherals), or browser-based games? Pretty open on genre, I enjoy most anything.