draw.io - Online diagramming application
CKFinder - CKFinder is a powerful and easy to use Ajax file manager for web browsers.
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.
Flmngr - Free PHP File Manager
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Tiny File Manager - Web based File Manager in PHP, Manage your files efficiently and easily with Tiny File Manager