Web based IDE?

I'm looking for a decent free web based IDE for my server. I've come across a few good commercial solutions but they are a bit expensive for what I'm trying to do. Does anyone have any suggestions?

Edit:

I'm looking to do C and Java development from this.
 
Any reason why it has to be web based? I'd suggest to set it up as a cross build/debug/source revision host and then just work with Eclipse or similar locally.
 
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