Snipper.ml - A simple snippet manager in the menubar
RequireBin - Prototype browser JavaScript programs using modules from NPM
Snipline - Command-line snippet organiser for power users
30 seconds of code - JS snippets that you can understand in 30 seconds or less.
PasteCloud - Store pieces of text or code and share it with everyone.
RunKit - RunKit notebooks are interactive javascript playgrounds connected to a complete node environment right in your browser. Every npm module pre-installed.