Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Typora - A minimal Markdown reading & writing app.
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.
StackEdit - Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
SoftMaker Office - SoftMaker Office is one of the most powerful and reliable office suite that is fully compatible with the MS Office Suite.