TinyMCE SpellChecker API – this plugin provides action/filter hooks to allow easy customisation of the TinyMCE SpellChecker.
This plugin was created to solve the problem of not being able to use GoogleSpell behind a firewall. For background information on the issue read the discussions on <a href="https://core.trac.wordpress.org/ticket/9798" rel="nofollow ugc">trac ticket #9798</a>. The ultimate goal of this plugin is to be merged into WordPress Core.
You need this plugin if…
<ul>
<li>You want to write a plugin for the TinyMCE SpellChecker. This plugin will provide you with respective hooks that allow to control which SpellChecker Engine is used, adjust the configuration used for initialisation of the engine and manipulate spellchecking results (independent of engine).</li>
<li>You are behind a firewall and you’d like to use the Google Spellchecker. This plugin contains a customised version of GoogleSpell that uses the new Http Transportation methods added in WordPress 2.8 which include Proxy Support for all external requests.</li>
</ul>
This plugin also contains a simple sub-plugin called “WP-SpellCheck Exceptions” which allows you to add custom words to the spellchecking dictionary. Note that this plugin is more a proof of concept than a complete/full-fleged solution. (It does not have any kind of visual administration; it only adds “WordPress” as an exception at the moment).

WP-Spellcheck

TinyMCE SpellChecker API - this plugin provides action/filter hooks to allow easy customisation of the TinyMCE SpellChecker.

tansadev

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<li>
Write to a higher standard 
Tansa is an advanced text proofing system that can check thousands of words per second. 
Not only will it correct nearly all spelling, style, punctuation and hyphenation errors, it also ensures that everyone in your organization follows the same set of rules.
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<li>
Everywhere you need it 
Tansa is a flexible solution that works in the most popular text editing applications, web platforms and page layout software.
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<li>
Custom dictionaries 
Your dictionaries can be adapted to suit your organization perfectly. We can help customize your solution by analyzing a large volume of your company’s published text.
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<li>
Save time and money 
Our customers have documented dramatic increases in productivity, reducing copy editing time by as much as 40 percent and drastically reducing published errors.
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<li>
Improve readability 
Tansa can identify the number or length of characters, words, sentences and syllables to ensure Plain Language guidelines are achieved. Tansa´s readability score is based on several indexes, including Flesch-Kincaid, Dale-Chall and SMOG.
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<li>
Write with variety and precision 
Tansa will suggest synonyms where there is more than one option. Synonyms develop your writing by giving you a more varied and richer vocabulary.
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<li>
Make your own adjustments 
The Tansa Web Admin is designed to work as both an interactive tool to direct Tansa´s proofing engine and as a searchable style guide. The type of permissions given to users are based on the users´ roles. Administrators will be able to edit and manage entries, while the majority of users will only be given permission to view entries and make suggestions.
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<li>
A multi-lingual solution 
Our solutions are available in more than a dozen languages. Multiple languages can be supported on a single server which makes it easier for our customers to distribute the solution to offices around the world. 
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<li>
Integrated and customized for your tools 
Tansa´s APIs allow customers to drop our proofing client into almost any editorial system, proprietary or out of the box. This creates a centralized editing solution, whether your users are working in Microsoft Word, Adobe InDesign or your own custom-developed web CMS.
</li>
<li>
Tansa learns from your mistakes 
Machine learning is actively used to improve our solution. Every time you run content through Tansa, the system keeps track of every error that is found, corrected or ignored. This statistical data is used to improve the system’s proofing results.
</li>
<li>
Customers worldwide uses Tansa 
More than 150k writers, editors and page designers around the world use Tansa on a daily basis to improve their editorial workflow.
</li>
</ul>
<h3>How to use?</h3>
Clicking the Tansa button gives a menu with the proofing options available to that user. Clicking one of the proofing options will make Tansa scan the whole or selected text and provide the finds in a user interface to the user, so the user can decide what changes should be done to the text.

Tansa

TANSA IS AN ADVANCED text proofing system.

WP-Spellcheck vs Tansa