Smos is a comprehensive self-management system.
It draws inspiration from Emacs' Org mode, Taskwarrior, Todoist and many other self-management tools, but it is specifically designed to be the fastest and/or most automated tool to use for self-management.
It has a TUI, an API server and a web server, all available for free.
You can find the source code under a free license on GitHub.
You can try it out online at the public deployment.
If this is your first time visiting this page, you probably do not know where to start. To get started, have a look at the blogposts about how to use Smos.
Be sure to also consider our self-management training if you are a busy person.