Waterpebble - Your little water saver
calculator.net - Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.
Apple - Available on iOS
Unigradecalc - Unigradecalc is a website that provides a tool for calculating GPA (Grade Point Average).
Blocks - Empowering designers to build great websites without writing a line of code. For web and OS X.
Easy Grade Calculator - Easy Grade Calculator is a website that provides a range of calculators, including Grade Calculators, Tip Calculator, Percentage, Loan, and Password Calculator.