I use the Atom editor and create markdown files (the markdown plugin is pre-installed). Shift-Ctrl-M to view markdown. I previously used OneNote (which I loved).

Atom search is good enough. The only thing missing is markdown print, but the view is beautiful.

I do wish there was a way to automatically upload my files to a cloud share (google drive, onedrive...). There seem to be ways to upload to github (including private gist's), but cloud drive would be better.