Dovetail - Mobile Cloud-Based Dental Software
draw.io - Online diagramming application
Proven By Users - Online Card Sorting, tree testing, first click testing and more.
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.
Hirundin - Helping design, product and UX teams understand users and make decisions based on their needs and goals
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.