Third-party TI-84 Plus CE / TI-83 Premium CE emulator
Scientific/engineering firmware repurposing HP business calculators!
Calculates income tax form entries, helps do your taxes.
Precision Trigonometry: Advanced Calculator for Complex Math
Calculates Shift Times
A command-line utility for calculating and verifying file checksums.
A Casio Fx702p handheld-computer emulator