Cloak VPN - Stay safe online when using untrusted networks
draw.io - Online diagramming application
Mozilla VPN - A VPN from the trusted pioneer in internet privacy.
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.
VPN Report - I test VPNs using my credit card so you don't have to
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.