Apps with 'suggestion' feature

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Nitpicker is a language style checker which compares your text with a large database of style warnings, common errors, or warnings indicating that you may have once more used the wrong word or preposition.

Sopularity helps you to add the most appropriate hashtags to your tweets. Just insert your tweet, select one or more of the suggested hashtags and post it. This leads to a significant increase of the searchability and popularity of your tweets.

Userwish is a SaaS web app that helps business owners build customer driven product roadmaps. It does this through Feedback/Suggestion boards called 'Wishboards'.