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.
DigitalChalk - Online Training Software and Learning Management System (LMS)
draw.io - Online diagramming application
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Onehub - Onehub helps businesses securely share and control files in the cloud.