pcsx2 emulator

Powerful, high reliable TN3270/TN5250 terminal emulator with SSL/TLS support.

Virtual CD/DVD-ROM and HDD emulator with speed control and ripping features.

AlphaCom is a powerful - yet inexpensive - multi-session terminal emulator.

Jagacy VT is a VT100/VT220 emulator and screen-scraping library using 100% Java.

A 3270 terminal emulator

Put simple - a mouse emulator

Data Communication Test Software - Modbus TCP Master Emulator

Data Communication Test Software - Modbus RTU/ASCII Slave Emulator

Rock-solid terminal emulator for encrypted Secure Shell (SSH1; SSH2)

If you already tried to install an emulator, you know that the main problem