Here are some scripts and kludges you can use.
Most of these scripts were developed for my personal use and are absolutely not guaranteed to work. But do try.

In development: educational software that teaches and lets users experiment with concepts of digital video technology. It can be used standalone by students or as a lecturing tool by instructors.

A tool for slit-scan photography, complete with the ability to switch between webcam mode (if available) and video file analysis, a GUI (including dragging and dropping video files) and keyboard shortcuts.

I have committed a number of Processing programs and experiments to GitHub (older). Here are some of the highlights, which I hope you find useful.

The Enhanced Lightbox is a jQuery plugin that allows designers and developers to overlay single images and/or image collections in a webpage, using very little extra markup.