CoolTerm is described as 'simple serial port terminal application (no terminal emulation) that is geared towards hobbyists and professionals with a need to exchange data with hardware connected to serial ports such as servo controllers, robotic kits, GPS receivers, microcontrollers, etc' and is an app in the OS & Utilities category. There are seven alternatives to CoolTerm for a variety of platforms, including Mac, Windows, Linux, iPhone and BSD. The best alternative is dterm (terminal emulator), which is both free and Open Source. Other great apps like CoolTerm are minicom (Free, Open Source), Zterm (Free), Terminal by Bra@y++ (Free) and Serial (Paid).
Terminal is a simple serial port (COM) terminal emulation program. It can be used for communication with different devices such as modems, routers, embedded uC systems, GSM phones,... It is very useful debugging tool for serial communication applications.
Get Console is the first ipad and iphone serial port terminal application providing serial terminal connectivity without jailbreaking. The app store description advises it works on network devices, but offers a standard VT100 emulation.