draw.io - Online diagramming application
UsersInsights - The Users Insights WordPress user plugin helps you manage your user data in one intuitive, beautiful and searchable place.
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.
Quantcast Measure - Quantcast Measure provides free cross-platform audience measurement for a mobile app, website, network or platform.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Talkwalker - Talkwalker Consumer Intelligence Platform: built for speed of insight, ease of use, and data democratization