CodeClimate - Code Climate provides automated code review for your apps, letting you fix quality and security issues before they hit production. We check every commit, branch and pull request for changes in quality and potential vulnerabilities.
sublimious - Sublimetext plugin inspired by spacemacs and heavily focused on VIM
ESLint - The fully pluggable JavaScript code quality tool
Diffy - A sublime plugin to show difference between 2 files. It supports both Sublime 2 and 3. - zsong/diffy
SensioLabs Insight - PHP Project Quality Done Right.
Emmet - It’s a plugin based on the Emmet standard. If you never heard of it and you code in HTML, this will blow your mind. You can create complete layouts with just one line of code, press TAB and presto. Have a look a the official website.