The best alternatives to Let's Markdown! are Upsite, Markdown to Medium, and Markdown Editor. If these 3 options don't work for you, we've listed a few more alternatives below.
Markdown Editor is a modern, open-source and developer friendly WYSIWYG editor, which features a web version and a native standalone version for mac,windows and linux os.
Markdown New Tab is a replacement for the default browser New Tab page. You can take down notes 🗒️, create checklists ☑️ etc., and all other Markdown frills! Your notes, revision history and settings will be synced between all your browser instances.
Jekyll-Markdown is a fancy markdown blog generator using jekyll. All your blog posts are edited in pure MarkDown and the blog is responsive on any device.