I was planning on just using a schedule, by using paper and pins on a corkboard to organize what I do from day-to-day.

but many times I forgot to do something because I was too distracted at doing one thing on the computer.

Is there a software I can use, a To-do list or a schedule app, that has reminders?

I'm using Archlinux + DWM so if there are keybindings that's a plus.