Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.
PCalc - PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody...
Numi App - Numi is a beautiful text calculator for Mac.
Calca - Calca is an advanced symbolic calculator for iOS, OS X, and Windows that's as easy to use as a text editor.
Calcbot for Apple Watch - Calculate, convert, and split tips from your wrist
Soulver 3 for Mac - A smart notepad with a built in calculator