Obsidian++ Cookbook - π - YouTube - Official Docs
Emacs and Org mode are to some degree the "originalβ extensible test editor and personal knowledge base. It is unclear the extent to which Obsidian was influenced by these tools. Emacs will have influenced many of the tools that exist in the world which in turn with have influenced the Obsidian designers (potentially via VS Code). Wikipedia is clearly another influence.
A downside of Emacs is that it not necessarily that easy to use for βnon-programmersβ whereas Obsidian is more discoverable and easy to use. That is why I use it. But you can can inspiration from Obsidian.
Plugin REPL is inspired by the ability to quickly evaluate code to hack up features in Obsidian.
I am not affiliated with Obsidian. I am the author of plugin repl