At the moment I'm trying out Standard Notes*. It's a note-taking app, for the web, Android, iOS, Linux, and also OS X and Windows. The most important feature of SN is the security that is built right in the product.
The app supports multiple editors and actions. An editor in SN is a view of the data. You can view your note with the Markdown editor or as a spreadsheet.
The actions are a way to call external services to transform or process your note. If you're a developer, you can extend the actions with your functionality. You can write a post to your blog or perform a transformation.
I like SN, because of security, availability, and extensibility. You can use it in many ways. For example, you can start a short post on your phone, do the final editing on the native desktop and post it automatically to your blog.
[*] Use the link to get a free month of Extended.