Two 4x3 whiteboards in my home office/study/library. On my laptop I use Sublime. I don't know if others use Sublime the way I do, but what I use it for is, it allows you to create documents that are restored when you close and reopen the app without forcing you to save to a file. That is very useful to me and this is my digital scratchpad of sorts.
I didn't consciously realized until you mentioned it but I use BBEdit as you do Sublime. Each time I come back they're all just where I left off. Used it for that for years.
I don't really have one, though I like the idea of having one. The only thing I do on a regular basis at work is write down a list of things I want to do each day and maybe some notes about the previous day in a physical notebook. Originally intended to remember what I did for scrum time, but it sort of helps keep on track during the day as well.
BulletJournal in a physical book (not the official one) for daily todos, because it's minimal. I use Apple Calendar for schedule, Trello (I work there) for planning, and I practice Zero Inbox.
Other things:
- RescueTime
- SelfControl (turn off distractions)
- My iPhone has no social media apps, runs silent with almost no notifications (calendar, slack mentions)