AVR Tools screenshots

AVR Tools provides a Mac OS X GUI for avrdude and includes a terminal emulator.
AVR Tools 0.3 : Main Window
AVR Tools 0.3 : Main Window

Alternative downloads

ZOC Terminal
rating

Telnet/SSH/SSH2 client and terminal emulator.

Serial Tools
Free
rating

Set of serial port tools for Mac OS X.

QuickTerm
Free
rating

It is a basic ASCII terminal emulator. It can use any attached serial port