OpenLaszlo | the premier open-source platform for rich internet applications OpenLaszlo started out declaring that their framework could be used for both dhtml and Flash, but they started with Flash, and that's what got stuck in developer's brains. They had demoed some dhtml/ajax versions last year, but now they've offically released version 4.0, with full support for Javascript/CSS/HTML/Ajax applications (earlier known as DHTML). The demos on the site have to be seen to be believed! For each demo, there's a Flash and DHTML version, and I think most people will have trouble telling one from the other. I've got to take another serious look at this framework soon!