Client-side GChart is a GWT chart library that supports line, pie, bar, area, and combination charts, popups, mouse events, and more.

• The
  live demo has advanced examples to illustrate what's possible.
• The
  Chart Gallery has simpler examples to help get you started.
• Installing gchart explains how to plug the GChart library into your application.
• The javadocs are so complete, you won't need a
  Wiki or a User's Guide
• The external resources page has links to applications, tutorials, and blog posts.
• The
  GChart Paint Test contains over 200 charts. Think
  of it as bug insurance.
• The release notes explain the most recent
  changes.

GChart is layered on top of GWT's standard widget set.
Specifically,
Image widgets (for curves) and Grid widgets (for
aligned text) are placed onto AbsolutePanels to render each
chart. Thus,
it works reliably cross-browser, fully exploits GWT's compiler
technology, and does not require proprietary
browser plug-ins, complex external Javascript libraries, or a server
hit each time the chart changes.

Though this approach has many advantages, high visual quality for
non-rectangular curve types isn't one of them. To fix this, GChart
lets you optionally bolt on an external GWT vector graphics library.

Where's the forum? Just use the GChart issue tracker, which doubles as the GChart forum.

As of version 2.7, GChart releases are signed with the following PGP key:

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I'm told there are people who can read these things like tea leaves.

• John C. Gunther