BambooHR - Personalized HR software for SMBs
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.
CharlieHR - Charlie automates many of the administrative headaches you'll experience when scaling a company, so you can spend less time doing admin and more time doing the things you love.
draw.io - Online diagramming application
Namely - Namely is the end-to-end HR, payroll, and benefits platform for growing companies.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.