What are some alternatives?
When comparing SANDMARC and Atom, you can also consider the following products
DJI Osmo Mobile - 3-axis gimbal stabilizer for your mobile
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
Shift - Shift is the ultimate email client for managing Mail, Calendar, Drive, Slack, Asana, Jira, Evernote, and all your other favourite apps
Sublime Text - Sublime Text is a sophisticated text editor for code, html and prose - any kind of text file. You'll love the slick user interface and extraordinary features. Fully customizable with macros, and syntax highlighting for most major languages.
Onyx by Titanium - This website provides operating system utilities for macOS
Vim - Highly configurable text editor built to enable efficient text editing