goSerial is software that enables communication with serial devices.
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.
Version 0.2alpha: N/A