Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
draw.io - Online diagramming application
OwnTracks - Cross-platform location sharing
UMLGraph - UMLGraph is a professional automated drawing tool that allows the designers the declarative specification and drawing of UML class and sequence diagram.