Here are some valuable Proofreading Programs:
Proofreading is not editing. There are excellent proofreading software programs that will help you correct your spelling, syntax and grammar.

ProWritingAid is a great tool to use. Even before you finish your manuscript, you can upload it to ProWritingAid and it will help you with overused words, writing style, sentence length problems, cliches, grammer, complex wording and other intriguing subjects. There is an annual fee, but well worth it. Most writers only need the regular, not the professional program.

Unplag is a great program that makes sure you don't use someone else's words as your own. Upload your work and get a report. It will detect original or close similarities to someone else's already published work.

Ginger is a plug-in for MS-Office or Google Chrome. This is the usual spell checker and grammar user. However, it features text-to-speech that will read to you. Listen for portions of your work that sounds un-original or contains cumbersome wording.