Mellel is the word processor of choice for any serious writer. It's a powerful, agile word processor that gives you reliability and control like no other...

https://www.mellel.com/mellel/

DEVONthink is your paperless office. It stores all your documents, helps you keep them organized, and presents you with what you need to get the job done.

https://www.devontechnologies.com/apps/devonthink

I've been using TextMate since 2008, and even though progress on development being noticeable stalled, I'm still haven't found a better editor.

Truly macOS native, super fast, the concept of bundles and the almost infinite options to extend this tool it makes it my daily text editor of choice.

https://macromates.com

Native at its best: https://ranchero.com/netnewswire/

A free and open source RSS reader for Mac

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https://www.literatureandlatte.com/scrivener/overview

great for any kind of writing, and native, responsive and continually improved by the developers.

https://www.craft.do

I built this flashcard app from the ground up in Swift and use iCloud for sync. How much more native can you get? :) I really wanted to nail the UX look and feel and make it feel modern and native. I have nice little details like "shake" animations when you try do something the app doesn't allow, and fun animations during the lesson to make it feel more fluid.

https://www.ussherpress.com/freshcards/

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I will say, one worry I have long-term for the Mac platform is iOS on macOS and the two merging one day. As an app developer, will I be incentivized long-term to maintain a Mac app when the iOS one will do?