draw.io - Online diagramming application
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
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.
Cool Cousin - Shaking up the travel world with good old human connection
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Triip.me - The happiest way to travel in 227 countries