Wabbitemu - Wabbitemu is an accurate emulator for Texas Instruments based calculators TI-73 to TI-86.
Emu48 - HP38/39/40/48/49 Emulator
TI Connect CE - Computer software that allows for connectivity between your computer and TI-84 Plus family graphing calculator.
meta-calculator - The most sophisticated and comprehensive graphing calculator online. Includes all the functions and options you might need. Easy to use and 100% Free!
AlmostTI - AlmostTI turns your Android device into a Texas Instruments graphing calculator.
TI Connect - TI Connect™ software allows for connectivity between a computer and graphing calculator. Transfer data, update your operating system (OS), download calculator software applications (Apps) and more to your graphing calculator.