JS WARS is a classic shoot 'em up written to demonstrate the power of modern Web browsers. It is targeting Firefox 3.5 with its audio/video support and increased performance, and uses the canvas tag. It should work well in other modern Web browsers (supporting the canvas tag), just without the music and sound effects.
Guacamole is an HTML5 Web application that provides access to desktop environments using remote desktop protocols such as VNC or RDP. A centralized server acts as a tunnel and proxy, allowing access to multiple desktops through a Web browser. No plugins are needed. The client requires nothing more than a Web browser supporting HTML5 and AJAX.
ThinVNC exploits HTML5 canvas to display a remote PC desktop without requiring any additional plugin, add-on, or installation of any kind on the client side. Regardless of the computer or mobile operating system, ThinVNC provides native, secure data transmission using HTTP and SSL. It includes a Presentation Manager and can be set up as a gateway to proxy other ThinVNC instances.