For the last few weeks I made my own notes client (mainly for [simplenote](https://simplenote.com/)) because the standard Electrum client felt pretty ... heavy.
Multiple backends are supported via plugins. Currently you can use it to access your notes on simplenote, Standard Note, Nectcloud/owncloud or no remote (aka local only).
I plan on adding Evernote support (only for plain, unformatted notes) and a better editor with a little bit of markdown highlighting (similiar to [qownnotes](http://www.qownnotes.org))
Tell me what you think and if you have ideas/criticism :D