Headspace - Meditation made simple. Brilliant things happen in calm minds.
draw.io - Online diagramming application
Calm - Calm.com can help you reduce stress and increase calm.
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.
Medito - 100% Free Meditation App that will improve your Mental wellbeing with the help of Guided Meditations, Breathing Exercises, Mindfulness Practices, Relaxing Sounds, and more.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.