Ask HN: Recommend a team work site with file sharing and a chatroom?

I've just started working for a small games startup. At the moment theres 3 of us actually working, (2 artists and me coding) and some other guys who do admin, pay us and sell our product. I'm wondering if theres some online platform that we can use to share game assets and also have a irc-style chatroom, also some kind of forum and email system would be desirable. Something like retroshare would be good but if it was totally online so you could access it from any machine without installing software or needing a big encryption key that would be better. If its costs money or needs a server thats ok too as I reckon the company would pay for it if its worth it.