Xnapper - Take beautiful screenshots instantly
draw.io - Online diagramming application
BrandBird - Brand your Twitter content uniquely
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.
Screenzy - A simple screenshot beautifier
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.