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Tempad

Official Description

Tempad for OS X is a simple yet innovative way of typing of note taking. No hassle, no distractions, just you and your notes:
– Native look & feel
– Silk-smooth experience
– Secured notes
– Search that works

And, of course:
– (SOON) Syncing between all devices (iOS, Android, ChromeOS)
– (SOON) Full markdown support
– (SOON) Typewriter mode

and more…