A handy service that lets you write Markdown online with a preview https://hackmd.io/
The good points
- Real-time preview
- You can use a Dropbox or Google account
- It is linked with imgur. Images you upload are automatically stored on imgur
- Can export to Dropbox, Google Drive and Gist
- Can import from Dropbox, Google Drive, Gist and the clipboard
- Can be downloaded locally in markdown or HTML format
- Content from YouTube, Vimeo, Gist, SlideShare and Speakerdeck can be embedded with simple notation
- Sequence diagrams and flowcharts can be drawn as well
Writing MarkDown in this online service and pasting it into a Hugo article is nice and easy