Tabb is trying best to be simple but effective web app. Its simple user interface can save time and efforts of managing the "project management software itself", you can put most of your efforts on more effective to-do-list or task management. Also there are some wonderful features, such as the file sharing, the live chat within team, the file uploading and downloading etc. At present, the users can apply for the 30 days free trial. Also you can find this app in Jolicloud App Center. Anyhow, it is a small web app, but it is a smart and strong tool to use.