draw.io - Online diagramming application
PhotoTime - Automatic face sorting & keywords tagging for your photos
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.
Piwigo.org - Manage your photo collection with Piwigo. Piwigo is open source photo gallery software for the web. Designed for organisations, teams and individuals.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook