Google Scribe is writing tool that helps not only with spelling but also grammar and offers suggestions "predicting" the word or phrase you wish to use next. Great tool for beginning writers and for non-native English speakers.
I used 'scribe' to write the following sentences ONLY with their suggestions.
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It really is pretty amazing, but a bit slow for someone who types quickly. It's a very useful tool. It helps keep the sentences flowing, and stimulates the thought process for the writer who is searching for the right word.