At work: Org mode (Emacs) Personal stuff: I just send emails to myself. Something like: '[TODO] Do something ...' Then you can elaborate in the message body.

At work: Org mode (Emacs) Personal stuff: I just send emails to myself. Something like: '[TODO] Do something ...' Then you can elaborate in the message body. Pros: - free - simple - no apps required (or: you can use any app/web client you want) - easily done and accessible from anywhere - auto sync out of the box - search/filtering out of the box - timestamps out of the box - tags out of the box (via email tags/labels) - groups/projects out of the box (via mail folders/inboxes) - rules out of the box (via email rules) - supports files, links, code snippets, formatted text etc. - I can flag/unflag them, delete/restore, mark as read/unread and so on - most clients allow you to add a reminder/follow up for an email (hence, reminders and notifications out of the box)