Prepros - Compile Less, Sass, Scss, Stylus, Jade, Coffeescript, Haml and Markdown with live browser refresh.
stylelint - stylelint is a modern CSS linter
CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
Fire.app - Fire.app is a menu bar only app for dead easy HTML prototyping.
BEM - BEM — Block Element Modifier is a methodology, that helps you to achieve reusable components and code sharing in the front-end.