There are many plug-ins for Org-mode, including Org-habits and Org-notify. If Org-mode lacks some piece of functionality, it is very easy to add it.

Emacs with Org-mode is free as in beer and free as in speech – that is, it costs nothing and it’s totally open source.

For exporting to html, bootstrap, js-reveal and much more.

This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.

Users are not tied to one service provider, program, platform, or database engine.