1)   dhtmlxGrid - JavaScript Grid Control 1.1
Cross-browser JavaScript grid control for displaying and editing tabular data in DHTML based tables. Comprehensive features include fast-loading (enabled by AJAX), column sorting and resizing, multiple in-cell editors, paging support, and more...

 2)   ActiveWidgets Grid (Free Edition) 1.0.0
Beat your competition with fast and reliable cross-browser data grid component. Advanced JavaScript library, professional design, quality source code, documentation, examples, support community. And all that for free (GPL).

 3)   CodeThatGrid 2.2.5
CodeThatGrid is an advanced JavaScript Grid that enables user to display massives of data.