CSS Peeper - Smart CSS viewer tailored for Designers.
Ralpha Image Resizer - High-speed image batch conversion tool
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Purgecss - Easily remove unused CSS
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.