goSerial

If you ever need to talk to serial devices, then goSerial is the application for you. It's a terminal-type application that mimics the behavior of hardware terminals that were used in communicating with servers and mainframes years ago. Nowadays, there may not be a lot of people who need to communicate with servers using serial cables, but there are still many devices that use a type of serial connection, such as modems, routers, cell phones, communications equipment like Packet Radio, and industrial or medical equipment.

Though, most new Macs don't have an old-style serial port, they do have an internal modem that acts as a serial device. But, if you need to talk to external serial hardware, then you can get USB serial adapters or PCI cards with serial ports to do the job.

The latest version of goSerial comes with some great features such as built as a Universal Binary and time limit is now removed. It's an excellent utility for anyone who needs to talk to serial devices.