- Alfred (launch bar extraordinaire)

- Keyboard Maestro (automation)

- TextSoap (clean text with various cleaners [regex etc] that can be saved and invoked on selected text, entire files, or batches of files throughout the system)

- Klack is fun to add typing sounds (helps me stay in the zone)

- Dark Noise for background noise (stay in the zone) — although MacOS has some background noise generation built in now

- 1Blocker (ad and tracker blocking; also for iOS)

- Voice Dream Reader (read articles / any text aloud)

- Default Folder X (set defaults for how files get saved — e.g., which directory to default to for a given file extension)

- Rectangle

- Fantastical (calendar with lots of thoughtful additional features)

- Karabiner Elements (to turn Caps Lock into a hyper key; right Command key + hjkl into arrow keys; sky's the limit)

- TextExpander

- Homerow or Shortcat

- HoudahSpot (great file search utility; can save searches, save templates, and export Smart Folders)

- OmniFocus (to-do / task management; GTD-centric)

- TaskPaper

- Good outliners: OmniOutliner, Bike

- nvALT (barely alive; Brett Terpstra's nvUltra has been on the cusp of release for like 7 years now …)