TheTimeCalculator.org - The time calculator helps you either add/subtract times in hours, minutes, and seconds to a given date.
itch.io - An online game marketplace and community.
Calculator-online.net - The 100% free and reliable online calculators that help you to solve any calculation-related problems and provides you with the precise measurements.
GOG.com - DRM-free game store, selling both new and old titles. No clients required.
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 .
GnuPlot - Gnuplot is a portable command-line driven interactive data and function plotting utility.