Rainglow Color Themes - 320+ color themes for a variety of editors and software.
Color Palette Generator - Enter the URL of an image and find its color palette
Slack Themes - Make your Slack pretty with custom themes
Color Hunt - Curated collection of beautiful colors, updated daily
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!