Dimdim, an open source company that produces software for online meetings, has raised $6 million in a Series B funding round led by Index Ventures, Nexus India Capital, and Draper Richards. This round brings Dimdim’s total funding to about $9 million.

We originally wrote about Dimdim in Fall 2006, when the company released an alpha version of its web meeting software. Since its public launch in Fall 2007, Dimdim claims to have had 500,000 users worldwide. Earlier this year Dimdim introduced a hosted version of its web meeting software that allows companies to host meetings on Dimdim servers “in the cloud”.

Dimdim sees competition from sites that include GoToMeeting and WebEx.