Microsoft Project online! Well, not exactly, but the idea behind Basecamp is just the same as Microsoft Project - project management and collaboration tool. And it is entirely web-based, which means that you can access this tool anywhere with an Internet connection. They hope to make it user-friendly but with very useful features as well. Furthermore, being entirely online, groups can easily collaborate without any problems.  BAsecamp also support multi-languages, making it even more communication friendly. They have different paid accounts to suit your needs. But all plans comes with unlimited user accounts so you can add as many as yu want. Heaven!