Vectro - the rpn calculator. To enter a number, start typing and then press enter.
+ - * /basic math stuff
n(N)egate +/- sign i(I)nverse, 1/x l(L)og base 10
pinsert (P)i @sqrt ^x ^ y power %x modulo y
!factorial
s(S)wap values <backspace>drop value <enter>dup value
⌘+zundo