Guacamole: Open Source + HTML 5 VNC
Guacamole is a very promising-looking HTML 5 VNC program. The latest stable release is 0.2.6, and is only available in source code. If you don’t mind getting your hands a little dirty, dig in. It has quite an impressive list of features. Near-native performance Pure JavaScript/HTML5 client-side viewer CopyRect encoding (if supported by VNC server) [...]
Google Chrome in Ubuntu: Impressive.
This thing is speedy and stable. Google just announced the release of Chrome 5, which officially supports OSX and Linux.
