jPDF Tweak is a Java Swing application that can combine, split, rotate, reorder, watermark, encrypt, sign, and otherwise tweak PDF files. You can use it to make printable booklets from your PDFs, to add PDF bookmarks, effects (page transitions), to combine multiple PDF files, to watermark them, to rotate pages that do not fit, to attach files to your PDF, to encrypt and sign your PDFs, to change metadata (like author or keywords), and much more.

The Commentator uses revolutionary real-time language processing to actually grok your code and add the necessary comments on the fly. No more doco to slow you down. Just install The Commentator and watch as your coding elegance is eloquently decorated with insightful, nuanced commentary ...as you type. What's more, The Commentator's powerful Personality Controls allow you to tweak it's output so completely that it's as if The Commentator is speaking for you.

Jython does its best to shield a Python programmer from the details of Java, but you'll still need to know some of those details to use Java objects and libraries most effectively from Jython.

Share is an experiment in designing a networked programming tool for distributed communities of practice. It is an IDE that automatically shares all the code you write with everyone else that is using Share, and keeps track of how that code is used.

Processing ported to JavaScript! Wowies!

eclipse+python=yay (now, how can one install pydev without the clunky Java baggage that Eclipse asks for...)

an argumentarium for Python

java-based svg framework

OpenLaszlo is an open source platform for creating zero-install web applications with the user interface capabilities of desktop client software.

AviSynth is a powerful tool for video post-production. It provides almost unlimited ways of editing and processing videos.

Teddy is a Java-Applet Drawing Program that takes the 2D images you draw and renders them in 3D.

Ugly but useful

Generation5 aims to be the most comprehensive Artificial Intelligence site on the Internet. Community-orientated, Generation5 deals with all AI topics including robotics, neural networks, genetic algorithms, AI programming, home automation and much more.