A tool to create diagrams and visualizations using text and code.

mermaid

A nice list of articles on how to improve the performance by Chris Coyier 

Links on Performance

A free and intuitive web-based video editor.

A CSS Grid & Flexbox generator for creating layout components.

A command line app that enables you to turn any text on your screen into text on your clipboard.

An article on how to fine-tune your font files and optimize your loading strategy for maximum speed.

A library-agnostic Virtual DOM to serve as the core for Javascript libraries.

Add a vector-based, fluid hover effect to any simple SVG path.

A library of ready-to-use, cross-browser animations.

A nice list of various CSS Generators for things like CSS shadows or overlays.