Sorry, he was asking for a shell and I should have said it give you some common linux tools, including bash, csh, tcsh, etc. And you can run gcc under it. And would hopefully be able to get ARM cross-compiling support.

People have set up ARM dev environments for hacking around on Nintendo GBA and other platforms.

For an actual OS, you can also dual-boot some linux distribution and Win2K, etc. You'd still need to set up with an ARM-capable compiler though.

Bruno