Simple alternatives to Adler Notes

I've been using Adler Notes for a while, mostly because the feature set is simple enough (cloud sync, text notes, lists).

It only syncs to Google and Dropbox though, so I'd love sth that's:

• FOSS
• Similarly simple and minimalistic
• Syncs with NextCloud
• Preferably doesn't cram unnecessary features like handwritten notes, gratuitous markdown, etc.