ACollab is a fully accessible, open source, multi-group, Web-based collaborative work environment. ACollab is available as a work groups addon for ATutor 1.4+ , and as a standalone collaborative work environment that will run on its own. ACollab is ideal for groups working at a distance developing documentation, collaborating on research, or writing joint papers, and ideal for online educators who wish to add group learning activities to their ATutor courses.