RunKit - RunKit notebooks are interactive javascript playgrounds connected to a complete node environment right in your browser. Every npm module pre-installed.
30 seconds of code - JS snippets that you can understand in 30 seconds or less.
Monitask - Employee Monitoring Software with Screenshots, Internet, Activity and Time Tracking
Observable - Interactive code examples/posts
CodeMyUI - Handpicked code snippets you can use in your web projects
glot.io - An open source pastebin with runnable snippets and API