Some powerful Javascript tools

As the web-browser turns into the client of choice, it's good to have powerful tools to hand.  To whit:

• HTML/CSS manipulation (esp. for Ajax): jQuery
• Javascript Optimizer/Checker: Google's Closure compiler
• Information Visualization: JavaScript InfoVis Toolkit and Protovis
• Javascript charts and graphs: A selection of 13 tools
• Vector graphics: Raphael (plus charting extension, gRaphael): clock example
• Client-side GraphViz: CanViz
• Background processing: Web-workers
• Push: Web-sockets

 No doubt more to come.