Thanks to Niran Beharry, an installation of Mattermost (open source Slack like group chat service) has been made available on his server. You can create an Mattermost account at
http://tmm.pro-tt.com:8065/signup_user_complete/?id=yx1b9zedefbotku58y8q757yoc

and see what Mattermost is like

Dev Anand