Testing gadgets outside Google Wave

Here are two sites which will help you test your gadgets outside Google Wave:

• Google Wave Gadget API emulator
• Google Wave Gadget Emulator

Essential developer gadgets: CodeSnippet Gadget

Harry Denholm published a useful gadget which allows you to insert code clippings into your waves with full syntax highlighting. Here's how it looks like:

I'd say that's an ideal solution to discuss code online. Here's the wave containing the installation link.