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Online sequence diagrams from code. Used to be good but now lacks functionality and design. Has interactive diagrams which is cool.
draw.io - Online diagramming application
SequenceDiagram.org - Clean and fast online sequence diagram tool using scripting and Drag and Drop
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.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Swimlanes.io - Swimlanes.io is a simple free online tool for making sequence diagrams.