SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
lwty.org - worksheets or practice exercises, calculators & answer sheets to engage the grade school...
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Free42 - Free42, an HP-42S calculator simulator
Numi App - Numi is a beautiful text calculator for Mac.
Calculator OSX App - Real Time.