This question was recently asked and closed: https://graphicdesign.stackexchange.com/questions/6054/what-are-the-best-online-collaborative-tools
That particular question had several problems (off-topic, showed no prior research), but also fits in the the general software-recommendation category that is frowned-upon across the network as "not constructive".
We have a tag for software-recommendations that probably has many questions that would fall under this same banner.
- Should we allow these types of questions?
- What are the reasons for & against?
- If we are going to allow these sorts of questions, how tightly do we define the scope and should we update our FAQ with appropriate guidance?