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.
userinput.io - Get on-demand feedback for your app, website or idea. Learn how to improve by hearing real opinions.
draw.io - Online diagramming application
UX Timeline - See how some of today's best companies have evolved
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
UXReality - UXReality: One App Instead of Lab