dhtmlxTree is an Ajax-enabled DHTML treeview component which provides robust and flexible solution to represent and manage hierarchical data. The tree can load its content dynamically from server using Ajax or directly from on-page XML data-island. Ready-to-use solution for server-side integration is available. Advanced features include powerful script API, in-line node editing, drag-n-drop capabilities, built-in checkboxes and context menu. Standard edition of dhtmlxTree is distributed under GPL.
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The JS Auto Form Validator is an easy-to-setup form validation script which enables you to handle the whole form validation process without writing any JavaScript code.
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LazyJ is a rapid development framework for Java-based WEB applications. It includes a very fast template engine, page caching and data caching, database wrapper with connection pooling, database-backed sessions, time-bounded servlet execution.
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dhtmlxTree 1.5 details 
