SLACK offers channels for chatting and it does not demand a heavy profile to join in. It is closed: confidential chats can be opened between the invited group members. Very handy for WBL or for project management. Fashionable tool for good reasons.
With TRELLO we can manage projects: it is handy in organizing and seeing pending tasks and can be used in any context (including WBL). It takes a while to understand it but that’s surely worth while of learning. This digitool is used in fashionable hot working places!
Instructions for Trello usage can be found here