There are a few open source alternatives that let you store your notes locally.

In no particular order,

1. QOwnNotes - https://github.com/pbek/QOwnNotes

2. Joplin - https://github.com/laurent22/joplin

3. Zim Desktop Wiki - https://github.com/jaap-karssenberg/zim-desktop-wiki

Boostnote was pretty good as well, but it seems like after the change in leadership, there has been some issues.

What issues does Boost have now? It seemed like one of the better options for code notes

It doesn't store its notes as markdown. It uses a format called cson. Still easy to parse, but cant open Boost notes in another editor easily.

I am also curious, still my daily note app, haven't noticed anything (app facing wise, not following OSS drama if there is any)

I've been using joplin for several months now and I'm loving it. The GUI client isn't perfect and there are a couple missng abilities from the iOS app (e.g. duplicate note), but nothing has been a show stopper and it's both easy to set up and very reliable.