In the 2017's Google Code-in, students researched open source team communication and collaboration tools, documented them and recommended their use for Wikimedia's outreach activities, events, and team communication: https://meta.wikimedia.org/wiki/Research_on_open_source_team_communication_tools. Since the last couple of years, tools listed in the documentation have received new updates and features. There are also a few tools like Gitter (that was previously not open source but has recently become), Discourse, and others that are missing from the page. This task is about updating the documentation for existing tools (including screenshots), researching new tools, and adding them to the page.
Note: Please do not make direct changes to the page on meta-wiki. Create a Sandbox page as a subpage of your user page in meta-wiki (something like https://meta.wikimedia.org/wiki/User:SSethi_(WMF)/Sandbox, mine is currently empty though :-/)