draw.io - Online diagramming application
BaseMap - BaseMap is the only outdoor app you will ever need. Turn your phone into a GPS, map your outdoor adventures, and interact with the BaseMap community.
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.
GPS Status & Toolbox - Display your GPS and sensor data: Shows the position, number and signal strength of GPS satellites.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
HuntWise - THE ULTIMATE HUNTING TOOLSET. With advanced mapping overlays, hunting predictions, GPS navigation, weather forecasting, and more.