ThinkCalculator!

Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.

SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited Variables, Syntax Highlighting, Functions, with 'Automagic' Completion, 50 Decimal Precision, Input History and more...

Mathematica is a computational software program used widely in scientific, engineering, and mathematical fields and other areas of technical computing.

Qalculate! is a multi-purpose desktop calculator for GNU/Linux and Windows. It is small and simple to use but with much power and versatility underneath. Features include customizable functions, units, arbitrary precision, plotting, and a user-friendly interface (KDE or GTK+).

Online math solver, equation library, graphing calculator and science/engineering problem helper.Calculate multiple equations at once, Edit existing formulas and Create new ones, Compute large numbers of values, Plot graphs, Link your results, Solve full problems and Share worksheets with your friends.

One tool - One point of maintenance. With TextPipe you specify all your text processing functions in one place, rather than remembering and managing multiple manual jobs across various text editors, command line tools, custom scripts and Word and Excel macros.

Calculator for the GNOME Desktop Environment, formerly known as gcalc (and gcalctool CLI).

A suite of simple, single task, browser based, text manipulation tools.Most or all tools are client-side and do not store data on the web server.

Enter your math problem, and let Cymath solve it for you step-by-step!

galculator is a GTK 2 / GTK 3 based calculator with ordinary notation/reverse Polish notation (RPN), a formula entry mode, different number bases (DEC, HEX, OCT, BIN) and different units of angular measure (DEG, RAD, GRAD). It supports quad-precision floating point and 112-bit binary arithmetic.

Free web-based text & list manipulator and scraper which allows any user to perform multiple actions on the same input file in 3 easy steps.

Wordcounter is a word count and a character count tool. Simply place your cursor into the box and begin typing. Word counter will automatically count the number of words and characters as you type. You can also copy and paste a document you have already written into the word counter box and it will display the word count and character numbers for that piece of writing.Knowing the number of words or characters in a document can be important. For example, if the author is required to write a minimum or maximum amount of words for an article or paper, word counter can help them know if their article meets these requirements. »

Text manipulator online to split, merge, duplicate, remove, replace, add, edit, sort and convert your text using conditional expressions for free.

Calculator Plus is a nice addition to hundreds of Calculator apps but with unique idea and innovative and user friendly designed buttons.