A complete plugin to let your users manage everything from frontend. The best front-end plugin available for WordPress. It has front-end post submission, user dashboard, registration form builder, profile builder, charge for posting, guest post and many more features.
WP Project Manager is a web based project management software for WordPress with frontend feature. It is completely open source. So you can customize it exactly the way you want. It also has file sharing, task list, calendar, milestone, private messaging and discussion features. It also has some add-on to enhance more functionality.