My favorite ones, in order, are: MWeb, The Archive, and Quiver. I typically start in The Archive, and print/spell check/grammar check from Mweb. Quiver I use for code snippets using my Alfred workflow to paste them.
I will second Quiver, I've been using it for years. One of my favorite features is that you can switch between WYSIWYG and Markdown modes, and how you can include multiple "blocks" within a single document.
Thank you, added to list in post.
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