es1.js
Core, simply a package mananger for ECMAScript
API Documentation
(source)
es2.js
Basic, the core pakage manager plus basic language utilities.  This includes js.lang.createMethods which assists with Class creation.
For an example, see class-example.html.
API Documentation
(source)
ecma.js
For JavaScript and web sites
API Documentation
(source)
livesite.js
Livesite Networks common runtime
API Documentation
(source)