SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
NoteCalc - Browser-based notepad built for math calculations.
NumWorks - The graphing calculator that makes learning math easier.
Event Viewer - Get help, support, and tutorials for Windows products—Windows 10, Windows 8.1, Windows 7, and Windows 10 Mobile.
Calcbot for Apple Watch - Calculate, convert, and split tips from your wrist