Integrated TinyMCE with CSS and Javascript.

CodeMirror is a code editor component for the web. To create integrated HTML, CSS, and Javascript codes.

SVG-Edit is a open source online svg editor.

ImageMagick, invoked from the command line as magick, is a free and open-source cross-platform software suite for displaying, creating, converting, modifying, and editing raster images. 
WebAsOne implements, compress, modify, and composes images using ImageMagick.