draw.io - Online diagramming application
PHPRunner - PHPRunner builds visually appealing web interface for popular databases.
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.
Scriptcase - Powerful web low-code RAD platform. Unleash the power of web development and boost your productivity time creating delightful projects with magnificent BI solutions.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
AdminLTE - Web-based admin dashboard & control panel template. Highly customizable and easy to use.