For a few years I used each of Wily on a Sun box, then Acme SAC on Windows, and now hosted Inferno on Linux. I could use acme from plan9port, but I prefer Inferno because the whole environment gives me other nifty OS stuff like Inferno's shell sh and /env, which I make use of for the build tool I'm writing. The trickiest part of using Inferno is dealing with the different paths to files depending on whether you're running under emu (emu uses /n/local for files under host /, and / for files under host's /usr/inferno), or on the host (host uses / for files under emu's /n/local, and /usr/inferno for files under emu's /).