codebeat - Automated code review for Swift
Anyfiddle - Build, run and share code in any language from your browser
CodeStream - CodeStream helps development teams resolve issues faster, and improve code quality by streamlining code reviews inside your IDE
Snipper.ml - A simple snippet manager in the menubar
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.
CodeMyUI - Handpicked code snippets you can use in your web projects