codepad - Very simple webpage with a simple textbox, a checkbox for selecting one of several languages and an...
CodeKeep - Codekeep lets you store and share bits of code and text with other users. Snippets can be organized into folders/labels for instant reuse.
Betterer - Improve your codebase, incrementally
CodeMyUI - Handpicked code snippets you can use in your web projects
Anyfiddle - Build, run and share code in any language from your browser
CopyCoding - Machine learning and data science online community