My Primary Productivity Tools
As attested by my Apple Store's 'Purchased but not Installed' list, countless mostly-blank journals and notebooks, and other seldom-used productivity-related things, I've experimented with a lot of this stuff. Below is what I've settled on, ranked in importance. I've been using this combination for 2+ years now:
Essentials
Moleskine’s large Cahier journals: cheap, 80 pages (not too long, not too short), simple, no gimmicks needed.
This pencil, because no other pencil should exist.
David Seah's Emergent Task Planner stickypads: a to-do list, daily calendar, and post-it reminder in one.
Writing
AlphaSmart Neo: a distraction-free word processor that boosts my writing output 2x or more.
Technological Support
MacBook Pro (Retina, 13-inch, Early 2015): sleek design—inside and out--like most of Apple's products.
Omnifocus: task management software that is intuitive, customizable, and based on the David Allen 'GTD' model.
Bear: a minimalist tool for archiving, Markdown-ing, brainstorming, and a bunch of other stuff—Evernote without the fluff and over-complication.
iMac (Early 2008): still going strong, although it can't use the latest versions of MacOS to my dismay.