MarkdownPad is a free Markdown editor for Windows that that can convert Text to HTML or XHTML for you easily. Dwnload the free version here.

Converting Google Docs documents to HTML is easy. You can export documents as HTML, or use Docs to Markdown add-on from the Store to get the job done.

If you search the web you can find a number of references to programs/scripts that convert diff output to HTML. This is a bash version. The script expects "unified" diff output (diff -u) on its ...