This may not be the most well-known service, but it is quite useful for anyone who writes. It not only checks spelling and punctuation but also reminds you of the rules. I think this is very important, as it helps avoid similar mistakes in the future. Another interesting feature is the text analysis for "water" in the "Quality" section. If you strive for perfection, you'll appreciate the "Beauty" tab. Orfogramka checks the text for tautologies, synonyms, and epithets. Overall, the service works even better than some editors ;) I deduct one star for the paid features. The free version only allows checks up to 6000 characters.
