Collaboration App Recommendation
 

I'm planning a very small online consulting business that will have only a few clients, no employees (perhaps a contractor or two from time to time, depending on the scale of the project) and no physical office or servers. I need a Linux collaboration tool that is preferably open source, free or very inexpensive, cloud based and very simple to use (both for clients, my team and myself: it doesn't need to be elaborate).

Any recommendations? Based on actual user experience would be great. Thank you.

Redmine?

@ Habitual: Thanks. I didn't install it but I did look closely at the info on their site and the app seems much more elaborate than what I need. Also, the extensive and active bug list was somewhat unnerving.

There's a paid app called Confluence that looks close to the mark. $10per month including cloud storage seems reasonable. Know anything about it?

I do not, sorry.