YourQuote - YourQuote is an interactive mobile app that helps you to write stories, quotes, screenplays, poems, and books.
draw.io - Online diagramming application
JotterPad - JotterPad Writer for Android — Turn your thoughts into text. Go about your creative writing without distractions, write to your hearts content...
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.
Inkspired - Inkspired is one of the largest platforms that help professional and new writers/readers to discover, publish, and write creative stories or books.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.