I had been steering away from C# for a while, because it was "just a Windows thing", and it fell out of my current needs. However It's been gaining popularity and now with Mono catching up, it's becoming more attractive but I was wondering what IDE are people using to Code C#(with Mono) on *nix platforms.
I'm using Textmate on Mac OS X, it's the uber most awesomest editor on any platform, but it's not an IDE.
On X11 based systems i think i preferred Kate if i recall correctly.
As Mono For Linux Developers shows, there are at least 3 Eclispe plugins for C#.
Black Sun: http://black-sun.sourceforge.net/
Emonic Plugin: http://emonic.sourceforge.net/
C# Plugin from Improve Technologies: http://www.improve-technologies.com/alpha/esharp/
I have been very unhappy with the editors (compared to VS.net), but I think under windows it's possible to develop .net with VS and then also test it against mono, to check if it works on both platforms.
I use Vim for all my *nix stuff. There's even a Vim plugin for VS (ViEmu) so you can use your Vim tricks from within the IDE as well.
XDevelop by Omnicore is another good alternative. It has some nice advanced features, it's multiplatform and it has a good Mono support.