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Dillinger

Dillinger is a cloud-enabled, mobile-ready, offline-storage, AngularJS powered HTML5 Markdown editor.

Type some Markdown on the left See HTML in the right

You can also: Import and save files from GitHub, Dropbox, Google Drive and One Drive Drag and drop files into Dillinger Export documents as Markdown, HTML and PDF

100% open source on GitHub and free of rights (MIT licence). You can host you own version.