Screens is an excellent VNC client for your Mac.

Features

• iCloud - Synchronize all your stored screens on all your iOS devices, including your Mac.
• Use Screens in fullscreen mode to make it feel your remote computer is right there in front of you.
• Easy to Use: Screens is an easy, user-friendly VNC client for Mac.
• Secure: Screens can connect to your computer through an SSH tunnel so your session is encrypted and safe.
• Multi-Touch: Screens supports many of the multi-touch features - such as pinch and navigation - you're already used to on your trackpad.
• Screens Connect: Make your computer available from anywhere with this optional helper app. Easy as flicking a switch. No messy router setup.
• Works Anywhere: Through Wi-Fi or a 3G network.