Personal stuff: Microsoft To-Do, I switched from Wunderlist only recently, and there is still a few features I'm missing (i.e. md support for item notes). I also use Google Keep for groceries list.

Once a personal project becomes too big/important (job search) or requires long-term planning (personal/professional side projects), I create a new Kanban-like board in Trello, which is adapted to the specific task at hand.

At work, I use the Atlassian suite (Jira, Confluence, Bitbucket), and I keep track of my day-to-days activity with pen and paper by writing what I expect to do during the day and note any issue I might encounter so I can bring it up during the stand-up the next day.