* Also keep Slack open when I am working. If someone needs something, they can ping me on Slack and I will be available within 5-30 minutes.
* Gmail stars for everything I can't address immediately. Everything else is dealt with immediately and inbox count is 0 for most of the day (both work and personal addresses).
* Iphone calendar (with alarms) for everything I am putting off for later or need to schedule/remember
* Iphone notes for everything I am putting off indefinitely (movies/books/games to consume, gifts to gift, songs to learn, general goals for the next few years, travel destinations, events)
* Occasionally I leave things out of place so that I remember what I'm doing next time I leave the house (tennis racket on the bike + tennis shoes and shorts/compression shorts in my bag)
That's pretty much it. I really don't like having to keep things in mind. And when I want to zone out on a run or a vacation, I can safely do so knowing whatever I need to accomplish is on one of those lists and will probably get an alarm from my calendar if its urgent. I used to love using Pocket for reading papers/articles when I don't have a reliable connection, but its completely broken now and doesn't save pages consistently or renders pages unreadable.
IMO maintaining a wiki is way too slow and (depending on your work place) only accessible across VPN, which is incredibly inconvenient. Paying someone to act as scrum master/maintain a kanban is generally a waste of money/time as well, unless you work at a huge company (10,000+ people across hundreds of teams). But I'm biased and have always had a strong preference for small teams.