draw.io - Online diagramming application
Worklife Slackbot - Your personal meeting assistant, in Slack
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Meetingbird - Powerful meeting scheduling and notes — right in your calendar
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
RemoteStandups - Join others and organise remote standup meetings together