I just love. It's easy to use and share
OnlineNotepad.org - Free browser-based text editor
Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
Shrib - Take notes online. 'Free and no login' or 'AI assistant, visitor stats, privacy and productivity': super simple, with publishing and markdown, share to all devices.
Typora - A minimal Markdown reading & writing app.
HTML-Notepad - HTML WYSIWYG editor for structured documents
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.