sMedium was created out of a need for writing stories on Medium, but the browser is just too damn distracting. The "s" stands for sweet, smooth, superb, or just any positive word that starts with an S.
Quick - It's written in electron and react so it's quick as hell.
Writing - The editor in sMedium is nearly exact to the Medium editor with just a few small tweaks, but it has all the same features that you expect with bold, italic, underline, headers, and lists.
Open Source - sMedium is open source, which is awesome because then anyone can go in and check out the code, and maybe gain inspiration for their next app.