Vimwiki's list and checkbox format, with daily headers set up by !!date. It's portable, can be fairly easily migrated, and it's all text. It's also perfectly p

Vimwiki's list and checkbox format, with daily headers set up by !!date. It's portable, can be fairly easily migrated, and it's all text. It's also perfectly portable with pretty much any text editor, vimwiki just makes indentation and nested checkmark management easy.