Starting with OS X Sierra if you've noticed that the fonts are rather thin in Atom or other Electron based apps, the reason was that subpixel antialiasing is turned off in the OS defaults even though it's enabled globally through the Preferences Menu.
defaults write -g CGFontRenderingFontSmoothingDisabled -bool NO
And restart Atom or logout and login for the setting to take effect.
PlatformIO IDE is a nifty integrated development environment available in Atom for embedded systems. It supports many different boards and platforms out of the box. PlatformIO Terminal is a terminal package for Atom that can be installed independently of the IDE.
The terminal comes with some basic theme support. This short note explains how to configure it for the Solarized colours. Other themes may be configured similarly.