For now this question will serve as a "living document" of all features.
Comments are plain text but support Markdown as a power up.
Namespace owner can moderate comments. They can
delete any comment as if they wrote it.
For details, checkout: What is a Namespace?
Control how Remarkbox looks on your site with a custom stylesheet.
Default avatars and optionally Gravatar.
It uses the same security abstraction as a typical "forgot my password" system.
Works anywhere that supports HTML!
Comments help your page SEO and search.
Comments are plain text but support MathJax as a power up for Mathematical equations.
Users do not need an account to comment!
All of your comments for all of your web sites from a single dashboard!