OrfoEditor is a simple text editor based on MacOS X built-in text editor TextEdit with some extended spell checking features:
- simultaneous spelling check for Russian, Ukrainian and English languages and also Russian grammar check;
- learning new words with language specific morphology;
- set/remove soft hyphenation for Russian and Ukrainian languages;
- see all word forms from main dictionary and your user dictionary;
- setting up spelling and grammar check options;
OrfoEditor also includes Russian Grammar Tutorial - large explanation for Russian language spelling and grammar rules, that includes self-testing unit.