These bookmarklets let you see how a web page is coded without digging through the source, debug problems in web pages quickly, and experiment with CSS or JS without editing the actual page.
CPAINT (Cross-Platform Asynchronous INterface Toolkit) is a true AJAX (Asynchronous JavaScript XML) and JSRS (JavaScript Remote Scripting) implementation that supports both PHP and ASP/VBscript.
Alice v2.0 is the next major version of the Alice 3D Authoring system, from the Stage3 Research Group at Carnegie Mellon University. It has been completely rewritten from scratch over the past few years.
Sprog is a graphical tool which anyone can use to build programs by plugging parts together. In Sprog jargon, the parts are known as 'gears' and they are assembled to make a 'machine'.
S. Sarsa, P. Denny, A. Hellas, and J. Leinonen. Proceedings of the 2022 ACM Conference on International Computing Education Research - Volume 1, page 27-43. ACM, (August 2022)
G. Nelson, B. Xie, and A. Ko. Proceedings of the 2017 ACM Conference on International Computing Education Research, ACM, (August 2017)Understand code before write code - tracing and examples first.