ABDialer 2
The best companion for your desk phone, just got better.
ABDialer is a phone dialer for Mac OS X Address Book. It can dial phone numbers with a single click, letting Address Book users avoid having to manually dial the number.
To perform this task, ABDialer can use any standard modem or mobile phone connected to the Macintosh and, optionally, use the computer speaker to play touch-tones directly to a desk phone.
Require Mac OS X v10.4 or later to work (Leopard and Snow Leopard fully compatible).
Full help and user guide integrated with the application.

GSG (GPRS Script Generator)
A software utility to generate Modem Scripts for GPRS - EDGE - UMTS and HSDPA connections.
GSG can control all parameters of GPRS protocol and create fine-tuned scripts for maximum performances. Additionally, GSG known settings for many mobile network operator around the world and can generate scripts with only few clicks. Help available directly on the application and with the enclosed manual.