ObsidianMD

I feel the pain, I also really want it to be open source (and I think it's funny that they talk about most of the community plugins being open source as a plus, but don't recognise how that could be a plus for the app as well if they open sourced it).

As for missing bits of LogSeq, I use both LogSeq and Obsidian together. I have my LogSeq graph and Obsidian vault use the same folder, and have them configured so they use the same default folders and date formats. It works quite well for me