Have a look at Taskade.com
Has calendars, has multiple user feature, has different types of data display (tree, roadmap, list etc.) can categorize with tags/colors and has a communication feature (chat and video) all of this is free for standard use.
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Have a look at Taskade.com
Has calendars, has multiple user feature, has different types of data display (tree, roadmap, list etc.) can categorize with tags/colors and has a communication feature (chat and video) all of this is free for standard use.