Beaver Notes. The android version is in early dev called Beaver pocket. Do note, it does not have folder/notebook feature afaik
SiYuan. You can notes as Markdown files but their sync requires payment (I don’t know much about Siyuan’s pricing). I don’t use this as it has “AI”, it can be disabled but I didn’t need it in the first place.
Joplin and Beaver Notes (soon) support syncing with syncthing and other similar options (Joplin also has it’s own paid cloud sync afaik)
The rest are available on Linux, but if you export the notes, you can use Markor on Android
There isn’t a 1:1 FOSS replacement for Notion. I’ve been also looking for one and haven’t found any.
As others have said, Appflowy and Affine are the best options that don’t require self hosting. Appflowy now has a web version too. There’s also SiYuan.
If you’re fine with self hosting there might be a few options mainly for database like functions, some provide a free trial/tier :
I recently found this on github : Muzik-offline
I’m also keepin an eye on this as it has flac support : Wora
There are more on this list : Alternativeto
foobar and musicbee are not open source afaik
Paisa was open source. The developer then removed it I guess. The repo you linked doesn’t host the app. The developer said it’s used for reporting issues. Edit : The repo is private
Cashew is open source GPL licensed. But it uses Google libraries which I guess prevents it from being on f-droid. Last time I used Cashew, the premium features notifications could be ignored and the app could be used completely for free, I’m unsure if that was changed though.
I found another app but it’s not on f-droid, you’ll have to use Obtainium - Monekin
I forgot to mention your app, I use it on my phone. Pretty fast app.
I was planning to add an issue - when the numbered list reaches 3 digits, it overflows to the next line. This was the reason I went back to Joplin. But I have high hopes for your app :)