If you're looking for a GrammarBot alternative, Grammarly is a good candidate. It offers a combination of personalized guidance and text generation to help you write more efficiently and effectively. Grammarly offers features like contextual suggestions, plagiarism detection and citation support, and it works on all devices. It also has a strong focus on user security and data privacy, with no data ever being sold or used for advertising.
Another contender is LanguageTool, which supports more than 30 languages and language varieties. It checks grammar and punctuation, offers tone suggestions and lets you rewrite text. LanguageTool is available as plugins for various writing tools and apps, including browser extensions, email and office software, so you can use it in whatever setting you happen to be writing. The premium version adds more advanced features, so it's good for individuals and teams.
If you're writing academically, Paperpal is worth a look. It checks grammar in real time, checks for plagiarism and offers a paraphrasing tool that tries to maintain a formal tone. Paperpal is integrated with MS Word and supports multiple languages, so it's easy to use and suitable for early drafts. It's also got data security credentials, with ISO/IEC 27001:2013 certification.
Last, Wordtune could be a useful tool to help you write more productively and with more confidence. It offers AI suggestions for rewritten text, writing prompts and content templates for emails and LinkedIn posts. Wordtune integrates with Google Calendar and Microsoft Word and is available as a desktop, mobile and web app, so it's good for whatever writing task you're doing.