Jquery-datalink is a project mainly written in ..., it's free.
A data linking plugin for jQuery
Note: The jQuery Data Link plugin will not continue past beta, but will instead be superceded by JsViews, which integrates data linking with templated rendering, using JsRender templates (next-generation jQuery Templates).
See this blog post for more context on the roadmap for jQuery Templates, JsRender and JsViews...