A few months ago I left Evernote for my own implementation because I felt that Evernote gave me too little expressive power: No hierarchy, no typed relationships, no plugins. Basically, I was looking for a combination of outliner and concept map, combined with easy image handling. Plus, I wanted to easily add _applications_ like an ebook library, journaling, timelines of events, and generation of static websites and presentations.
I am a huge fan of simplicity and even toyed with PicoCMS by the same author as Raneto. Ultimately though, at least for me, a combination of a simple mysql database with markdown as content format gave me the power I wanted for my personal knowledge base, https://knowfox.com