Oficalc Alternatives

SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and many features, such as variables, syntax highlighting, functions, persistent input history & more.

A simple yet powerful calculator that includes standard, scientific, and programmer modes, as well as a unit converter. It's the perfect tool to add up a bill, convert measurements in a recipe or other project, or complete complex math, algebra, or geometry problems.

Calculator provides simple and advanced mathematical functions in a beautifully designed app.

A calculator with the basic functions and a customizable widget.

Calculator++ is an advanced, modern and easy to use scientific calculator.

NumWorks designed an intuitive and evolutive graphing calculator to make learning maths easier.

Omni Calculator is a web/mobile calculator that solves concrete problems such as mortgage payment, gross margin, body mass index, break-even point, etc. It's very user-friendly, flexible and usable on web, mobile and as an embeddable web widget.

Free online scientific calculator from GeoGebra: perform calculations with fractions, statistics and exponential functions, logarithms, trigonometry and much more!

Multi Sum Calculator is a portable tool that calculates the sum of multiple values!

Kalk is a convergent calculator application built with the Kirigami framework. Although it is mainly targeted for mobile Linux platforms, it can also be used on the desktop.