Please just take care of 'subject' (doer) and verb tense. If you just match the subject with verb, you are okay with English.

I don't know if any such stuff is at all available but my gut feeling is that in the matters as delicate as grammar one is best advised to rely on his or her knowledge in grammar. If you honestly believe that your grammar falls short of the standard, then don't rely on any software for it. You'd better try to remove grammatical deficiencies to become more confident and less vulnerable to common grammatical errors.

I don't know if any such stuff is at all available but my gut feeling is that in the matters as delicate as grammar one is best advised to rely on his or her knowledge in grammar. If you honestly believe that your grammar falls short of the standard, then don't rely on any software for it. You'd better try to remove grammatical deficiencies to become more confident and less vulnerable to common grammatical errors.

True but to remove those deficiencies one must refer to and study the basics of grammar so that one can improve his grammar skills and that must happen with full efforts and willingly.

Humans have invented loads of things that are termed as 'auto'. However, behind every 'auto' there is a 'man'. What I mean to say is, no software can ever match the manually checking. Believe in yourself and as Kalyani said, you can do some study to master proofreading.