To Do List. What do you use? I use Trello

At work, I use OneNote due to its close integration with Outlook.

Personally, I used Evernote but recently switched to Bananote.

I just use sheet of paper and a pen

I already use too many and never know which is the best. I have trello, Asana, an XML and a regular doc file. And sometimes a simple board with an erasable marker is better, since it's easier to maintain. Right now I am getting sick of all these so-called productivity tools, which take a lifetime to update and maintain

Google Keep for life!
There's several electron based apps that are pretty good too.

Todometer is a great one!