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.
Swipes - Plan projects, take action and discuss.
draw.io - Online diagramming application
joinAir.com - Smart HR platform for small & medium sized businesses
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Perdoo - OKR methodology, software and coaching