CuteCom is described as 'graphical serial terminal aimed mainly at hardware developers or other people who need a terminal to talk to their devices'. There are more than 10 alternatives to CuteCom for Windows, Linux, Mac, BSD and Cygwin. The best alternative is YAT - Yet Another Terminal, which is both free and Open Source. Other great apps like CuteCom are Tera Term (Free, Open Source), RealTerm (Free, Open Source), dterm (terminal emulator) (Free, Open Source) and minicom (Free, Open Source).
Engineering, testing and debugging of serial communication. Supports RS-232/422/423/485 as well as TCP/IP Client/Server/AutoSocket, UDP/IP Client/Server/PairSocket and USB Ser/HID. Optimized for simple command sets of e.g. embedded systems.
RealTerm is a terminal program specially designed for capturing, controlling and debugging binary and other difficult data streams. It is far better for debugging comms than HyperTerminal. It has no support for dialing modems, BBS, etc. - that is what HyperTerminal does.
moserial is a clean, friendly gtk-based serial terminal for the GNOME desktop. It is primarily intended for technical users and hardware hackers who need to communicate with embedded systems, test equipment, and serial consoles.