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JUMLY must help you if you want some sequence diagrams in your web site. Without images and expensive heavy UML modeling tools, you can put sequence diagrams as easy as writing a few lines of JavaScript.

Easily create UML Diagrams from simple textual description. There are also numerous kind of available diagrams. It

Free source code and tutorials for Software developers and Architects.; Updated: 7 Nov 2012

jQuery Plugins, Popular jQuery Plugins, Latest Plugins, Best jQuery Plugins, Free jQuery Plugins, jQuery-plugins.net

Create interactive diagrams in JavaScript easily. JointJS plugins for ERD, Org chart, FSA, UML, PN, DEVS, LDM diagrams are ready to use.

Draw, share and collaborate on online diagrams. Easy web flow chart, network diagram, mockup, wireframe, UML diagrams like Class, Sequence, & data flow and process flow diagrams. Creately - free web-based software for online diagram software

ckwnc is a uml sequence diagram creation tool that uses an intuitive c-style language to automatically create uml diagrams that can be saved as an image or embedded directly into other pages

Andrew Brampton's Tech blog