Markdown Preview Plus (MPP) is a fork of Markdown Preview that provides a real-time preview of markdown documents. (Note: This is not the Chrome browser extension of the same name, which can be found here).
Should you have any problems while installing or using MPP please open up a new issue.
We also have a more detailed description of features.
Long instructions can be found here. In short steps:
markdown-preview-plusin Atom's Settings view.
Also of interest might be issues marked as "help wanted"
Markdown Preview Plus (MPP) is released under the MIT license.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.