Carnet is a free open source alternative to Google Keep. It lets you take notes and sync them with a NextCloud account. You can follow Carnet here:
It's available for Android (through FDroid and Google Play) and NextCloud. The website is at https://getcarnet.app
Developers can help out at https://github.com/CarnetApp
Translators can help out at https://weblate.lostpod.me/projects/carnethtml/
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!