Geany is a powerful, stable and lightweight programmer's text editor that provides tons of useful features without bogging down your workflow.

Simple JMeter performance tests API

Regular Expression Visualization Site - Create a Diagrams from your regular expressions

JS performance

ConEmu starts a console program in a hidden console window, and provides an alternative customizable GUI window with various features

A diagnostic CSS snippet that exposes potential performance issues in your page’s `head` element.

Place kittens as placeholders