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Alcoda Software
Provides spell checking and text editing functions to applications developed in Magic, Oracle, PowerBuilder, SAP, and Siebel.
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GNU Aspell
Free and Open Source spell checker used as a library or as an independent spell checking tool.
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Grammar Check.me
Offers a free online grammar checker that also pinpoints errors in spelling and writing style.
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Grammar.com
Provides a free grammar and spell checker, articles, tutorials, vocabulary games and more.
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Grammarly
Features an advanced grammar and spelling checker for proof reading documents.
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ieSpell
Free Internet Explorer browser extension that spell checks text entered into boxes on a web page.
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International Ispell
Provides an interactive spell-checking program for Unix which supports a large number of European languages.
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JavaScript Spell-Checker
Spell checking component for JavaScript designed for spell checking web forms and variables, Ajax spell checking, and real-time spelling validation.
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JSpell
Browser and server spell checking tool for the Java J2EE Platform, IIS ASP .NET Web Server, AJAX JavaScript, HTML, PHP,Oracle Forms, and Lotus Domino. Offers online demonstrations.
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Online Grammar & Spell Checker
Checks for grammar and spelling mistakes in English texts, and provides suggestions for improvement.
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Spell Catcher
Windows and Mac spell checking and writing software designed to work with any program and supports shorthand typing and and custom dictionaries.
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Spell Check Anywhere
Provides a spell check button to Windows programs along with an English dictionary.
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TinySpell
Small standalone spell checking application available in freeware and premium versions.
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Wintertree Software
Provides spelling checkers as well as dictionaries, word lists, thesaurus, and grammar checking software products.