Free and open source grammar checker.
Currently capable of identifying errors:
1) Incomplete sentence (fragment)
2) Subject Verb Plurality Agreement
Incomplete Sentence Example:
"John a very man."
Subject Verb Plurality Agreement Example:
"They walks into a classroom."
This software utilizes parts-of-speech tagging software that was
developed and published by the Natural Language Processing Group
at Stanford University. Many thanks!!! (Full citation in README)