Org Lens is a folding viewer for Org Mode files, that's self-contained in a single web page and comes with extensive screen reader hints.

Supported Org Mode markup: TODO items, tags, plain timestamps, export options; tables, bold/italic and horizontal rules.

Not supported: clean view / indent mode.

Colors from the Solarized palette, by Ethan Schoonover.

Org Lens is zen software under the Mu License: If you have to ask what license this software is released under, you're asking the wrong question.