First up is Rephrasely, which uses AI to help you paraphrase, rewrite and reword text while preserving its meaning. It supports more than 100 languages and has 12 free modes and 6 premium modes, so it's good for students, professional writers and anyone trying to get more writing done and ensure they're not copying themselves.
Another good option is LanguageTool, which checks grammar, suggests tone and paraphrases in more than 30 languages and dialects. Plugins and standalone apps let it work with a range of writing tools, making it a good choice for individuals and teams.