Frink - A practical calculating tool, unit conversion utility, and programming language designed to make physical calculations simple.
SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
NimbleText - NimbleText is a text manipulation and code generation tool available online or as a free download.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
Event Viewer - Get help, support, and tutorials for Windows products—Windows 10, Windows 8.1, Windows 7, and Windows 10 Mobile.
NumWorks - The graphing calculator that makes learning math easier.