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I usually write long form posts on stacked it.io. You can save your files etc there too. The markdown window and display window are side by side. You do need to copy and paste the markdown to post it to steemit though.
Short posts, I've found the Steemit editor to be ok. I'll try out busy.org later to compare. Thanks for the recommendation!

Great tip! I love it. So simple and it looks great. No, thank you for the recommendation :D

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