Yahoo API's and developer network

I aways believed Sun Microsystems gave maximum benefit to the computing world. They developed a lot of technology and made it Open source. Now since Sun is under grip of Oracle, who should take its place?
I believe Yahoo is slowly replacing Sun’s footprint of donating technology to the world.

I came across the developer network of Yahoo!. I can see most of their works are now Open source and very powerful.
Take the case of YUI3. Its a marvellous library and framework for web developers.

Just listing some of the best Yahoo Developer Tools

YUI - User interface, Javascript and CSS library framework

Mojito - Free Javascript MVC framework

Placefiner - An excellent tool

YQL - Yahoo Query language. A great console as well

YSlow - Firefox add-on if you are site developer

There were other quite few great ones

Yahoo! answers was great, but got eclipsed by stackoverflow.

Yahoo Messenger - got down due to google gmail plugin

You could see all Yahoo Developer offerings here..
http://developer.yahoo.com/everything.html