I've been using http://www.lumzy.com/ http://www.lumzy.com/ for some time now. Its free and does the job quite nicely.I havent used its collab features but its

I've been using http://www.lumzy.com/ http://www.lumzy.com/ for some time now. Its free and does the job quite nicely.I havent used its collab features but its evident that it has some nice ones.