If you're looking for an AI-powered writing assistant with a broad range of tools, Wordvice AI is a good option. It's got a range of tools, including an AI Proofreader, AI Paraphraser, AI Translator, AI Summarizer and AI Detector. That should cover a lot of bases, whether you're trying to improve an academic paper or produce more polished professional documents. With different subscription levels and MS Word extensions, it's available for individuals and teams, and it can help you produce polished, error-free writing.
Another powerful option is Trinka, which is geared specifically for academic and technical writing with a focus on editing and proofreading. It's got a grammar checker that goes beyond grammar, a plagiarism checker and a paraphraser that tries to preserve the original meaning. Trinka also has some specialized tools for academic writing, like a LaTeX proofreader and a citation checker. It's available as an extension for MS Word, Google Chrome and other browsers, so you can use it in whatever environment you're working.
If you need to support multiple languages, LanguageTool is a good option. It's got grammar checking, tone suggestions and paraphrasing tools for more than 30 languages. Plugins for writing tools and devices let you use it as an individual or a team. Premium subscribers get more-advanced grammar and punctuation checks, but the tool is good for professionals and academics who need to write in multiple languages.
Last, HyperWrite offers a variety of tools to help you be more productive and write better. Among its tools are a paraphraser, summarizer and email responder. It's geared for students, freelancers and businesses, and it can be integrated into your existing workflow. Pricing is flexible, too, so it's a good option for those who want to improve their writing but don't want to commit to an expensive subscription.