Typically I use pen and paper, but I’ve been interested in a tablet or similar device for a while and am interested in what other people are using.
The reMarkable 2 seems like a really cool option to play with, but also pretty pricey for trying it out to see if it would even work well.
While it’s not directly related, when playing in games, I usually use a paper character sheet for reference, a notepad for consumables, story notes, and HP, and Pathbuilder on my phone for spells.
Another Foundry + A/V on discord.
I also use discord for game related threads.
I’ve recently discovered a similar program called Guilded, which seems to have all the same important creatures of discord, but better organized (and a larger file share limit). We have not moved over, but I’ve been spinning up and organizing a server there, just in case Discord craps the bed like Reddit did.