Category
page 1Spell checkers
spell checker
software used to detect misspelled words, in a document

Grammarly
Hunspell
Hunspell is a spell checker and morphological analyser designed for languages with rich morphology and complex word compounding and character encoding, originally designed for the Hungarian language.
GNU Aspell
free software spell checker
Reverso
online translation and linguistic tools
ispell
thumb|Ispell suggesting words in Esperanto
Ispell is a spelling checker for Unix that supports most Western languages. It offers several interfaces, including a programmatic interface for use by editors such as Emacs. Unlike GNU Aspell, ispell will only suggest corrections that are based on a Damerau–Levenshtein distance of 1; it will not attempt to guess more distant corrections based on English pronunciation rules.
Cupertino effect
tendency of a spell checker to suggest or autocorrect with inappropriate words to replace misspelled words and words not in its dictionary
yoficator
thumb|100px|Yo (Cyrillic)|Yo