My top tools:

1. Instagram.com/tantramar — source of creative inspiration and (mostly positive!) feedback
2. 1Password — as with Harold, this clears a lot of overhead in my tiny, overworked brain
3. Drafts — the iOS app where I capture fleeting ideas, tasks, reminders, and generally begin most text messages, email messages, keyword searches, etc.
4. OmniFocus — my outboard brain; the only way I can keep so many balls in the air
5. Siri — keeping my absent-minded-professor tendencies at bay by letting me add to lists or create timers & reminders when the need strikes and I don’t have time to type it into Drafts
6. WATCH — gives me always-on access to Siri, Drafts, my Calendar, notifications, OmniFocus, 1Password… and discreetly notifies me of everything
7. nvALT — Brett Terpstra’s brilliant open source fork of Notational Velocity, this is my outboard institutional memory (on macOS; the data also syncs to iOS)
8. iThoughts — even more than a good outliner (nod to the outstanding OmniOutliner), a mind-mapping application is something that clicks for me. Visual/spatial rather than linear/hierarchical.
9. YouTube — seemingly endless supply of first-rate how-to videos for everything I need (from software to household maintenance to painting)
10. DayOne — an electronic journal isn’t something I thought would stick, but with nearly 1200 (mostly) daily entries, it’s a habit I keep going with. It’s easy to forget how much you’ve actually gotten done during a hectic day, and this helps keep it all in perspective — even if I never read them again. It verges on therapeutic.