PCalc
Used by 3 peoplepcalc.com ↗
“Depending on where my brain is at, I'll either use the Python REPL or PCalc in RPN mode as my desktop calculator.”
iliana etaoin Interview, Software developer catgirl · via Uses This 
“I inevitably have a copy of Pcalc running for quick calculations.”
Craig Hockenberry Interview, Programmer (The Iconfactory) · via Uses This
