Rialto (Rich Internet Application Toolkit) is a cross browser Ajax-based JavaScript widgets library. Because it is technology agnostic it can be encapsulated in JSP, JSF, Python, .Net or PHP graphic components. Development ceased in 2012.
The purpose of Rialto is to ease the access to Rich Internet application development to corporate developers. Ideally a Rialto developer have neither need to write or understand DHTML, Ajax, DOM code or RIA concepts.
Widgets library includes: forms, drag & drop, tree, data list with fix header and resizable columns, pop up, splitter and so on.
Rialto enables Single Page Application development, and is available under open source Apache License.
References
Rialto Toolkit Wikipedia(Text) CC BY-SA