I personally write a lot on Wavemaker Cards 4.0, just because I like the aesthetic and it’s all in the browser, yet can still work without internet. Novlr is another that I’ve used, but that has a paid option, and only like 5 projects available without paying. On the other hand, Novlr has a pretty good discord server
Scrivener is a popular choice but it does come with a one-time cost of about $25. I’ve used google docs for years and loved it. It made it easy to switch between devices, but recently a few writers (who write explicit material) have found some or all of their writing being deleted in the because of an AI checker that tries to get rid of spamming. So… pros and cons. You’d need to save stuff elsewhere.