Todo.txt-more: Efficiently managing your todo list and your time
This is a niche-solution based on the well-known todo.txt, for the more technically capable user. I mainly just wrote it for myself but maybe others can find use for it too (it's fully open source).
Reminds me of : https://orgmode.org
Does it support reminders?
Not really, though it wouldn't be hard to add, say via a cronjob.