Open Source for Mac OS X

Chicken of the VNC is a fast, lightweight VNC client for Mac OS X. A VNC client allows one to display and interact with a remote computer screen. In other words, you can use Chicken of the VNC to interact with a remote computer as though it's right next to you.

Chicken features automatic server discovery via Rendezvous; an auto-scrolling full-screen mode; keychain integration; CPU performance throttling; smart unicode keybindings; mouse button emulation and native multibutton support; tons of supported transfer encodings including Tight and ZLib; and customizable connection profiles.