Grammarly is a extremely useful browser extension but it not being free and open source makes me want something better. [Alternativeto.net](https://alternativeto.net/software/grammarly-grammar-checker/?license=opensource) had a few recommendations but nothing that seemed great. Any recommendations or git hub projects I can help with?

I want to have different alt accounts for YouTube (google), and other sites. What's the best way to do this?