The Welsh spelling and grammar checker with a thesaurus
Cysill, included in the Cysgliad package, contains both a grammar checker and a spellchecker. In addition to correcting spelling and general grammatical errors, Cysill can correct incorrect mutation and, when errors are found, the user is informed of the reason why the error is considered to be incorrect.

Above: Cysill identifies a spelling mistake and proposes corrections.

Above: Cysill identifies a grammatical mistake (a lack of mutation)
and suggests the appropriate correction.
It is possible to set Cysill to run from within Microsoft Word or as a standalone program for Windows 98 and Windows XP. Text from nearly any program can be sent to Cysill to be spellchecked by selecting the text and then pressing the Ctrl, Alt and W hotkey. If the original text is editable, Cysill can replace it automatically with the corrected text.

Above: Cysill and Cysgeir within Microsoft Word 2007. Both programs also
work with previous versions of Word as well as with the Open Office.org word
processor.
Cysill also includes a thesaurus which enables you to find different words that share a similar meaning, allowing you to improve your vocabulary and writing style.

Above: Cysill displays various synonyms for 'trist' ('sad').
Click here to watch a short video demonstration of Cysill in action