Calculator
RPN
Very easy to use RPN Calculator
JRPN 16c
Programmer's calculator similar to an HP 16c.
DozenCalc
A dozenal (duodecimal, or base twelve) calculator
ExprEval
Math expression calculator with variables and functions support
Mather
A powerful expression-based calculator, unit converter, and computation engine
MaximaOnAndroid
Computer Algebra System
WhatExp
Scientific calculator
Units
Powerful unit converter
