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Google Chrome Developer Tools - Get started with Google Chrome's built-in web developer tools.
draw.io - Online diagramming application
Firefox Developer Tools - Examine, edit, and debug HTML, CSS, and JavaScript on the desktop and on mobile.
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.
Code Cola - Code Cola is a chrome extension to editor online pages' style visibility.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.