Laszlo Systems, the original developer of OpenLaszlo, an open source platform for building and deploying advanced Ajax applications, has raised $6.6 million more for its third round of financing.

This is apparently in addition to the$8 million in funding the company got more than a year ago (see our coverage).

Investors include WI Harper Group, General Catalyst Partners, Sofinnova Ventures, Mitsui & Co. Venture Partners and others.

The San Mateo-based company offers a product called OpenLaszlo, which has been adopted by tens of thousands of developers, according to the company.