I still use RISC OS a lot, because Zap stomps all over any equivalent that’s available for Windows. The HoTMeaL mode, in particular, is great for HTML editing (you’re looking at a product of it, but don’t let that put you off).
Draw is excellent too, and you get it for free with the OS! How cool is that?!
In fact, if it weren’t for a few minor niggles, I would never have needed to get a PC at all, so I’m glad to see that RISCOS Ltd and Castle are planning to work together to bring it bang up to date. Because the world deserves RISC OS. Really.