Ext Core 3.0 Beta released under MIT license
extjs.com
extjs.com
Their ExtJS library switched to GPL in their 2.0 -> 2.1 upgrade ( http://www.alittlemadness.com/2008/04/24/ext-discovers-step-... ); for me this meant we had to remove ExtJS from our product.
There were 2 concerns: obviously the fact that it was GPL and we'd then be locked in to paying licensing costs or be forced to open source everything; but more importantly that this meant that the switch would hurt the project going forwards, and we'd be investing in a dying framework.
After the way they handled their switch to GPL, this feels like an attempt at confusing people into thinking that ExtJS is MIT licensed, rather than trying to be a better community player. Unless they're going to commit to putting ExtJS under the MIT license of course...
And don't even get me started on the background to their 'Ext GWT' product...
Aside from the licensing issues, I think the ExtJS developers (Jack Slocum et al) are great javascript hackers. ExtJS is a great javascript framework, particularly the data grid component.
There's also the upcoming Ext 3.0 Designer, which reminds me of the 280North Atlas GUI designer. http://extjs.com/forum/showthread.php?t=52258
I regard Ext Core to being quite similar to other libraries even though it could pack more quality features into just a relatively small file. That is, If I were looking for something "current" I would look into Ext Core as well. But I have high hopes for YUI 3 which will have dynamic loading of features and contextual programming with both CSS and Javascript to let folks create relatively safe and packaged Javascript programs that could then be embedded in other sites without disrupting their looks or functions.
Perhaps YUI 3 is a little bit on the "over-engineering" side, but so long as it works as a stable foundation down the road it could well be the future.
Though I stopped looking at them with all of the licensing crap issues from earlier. Not sure what this new license will entail for them.