Collaborative software (also referred to as groupware or workgroup support systems) is software designed to help people involved in a common task achieve their goals. Collaborative software is the basis for computer supported cooperative work. http://en.wikipedia.org/wiki/Groupware
Basecamp is a web-based project collaboration tool that allows groups of people to share files, meet deadlines, assign tasks, and centralize ...Unified Inbox, Asana, Zoho, Redmine, OpenProj and more. Find free and open source alternatives to popular software and apps at AlternativeTo.