Marketo, the software-as-a-service company offering marketing automation solutions, has raised an undisclosed amount in a third round of venture funding. Based in San Mateo, Calif., the company is backed by Mayfield Fund, among others.

Specifically, Marketo says it bridges software offerings that complement each other to help its customers optimize their marketing strategies. For example, many businesses use Google Analytics to understand web traffic, where it's coming from and why, and tools from Salesforce.com to keep track of their customers. Marketo's software connects these functions. It generates revenue by selling its software to B2B companies at varying prices, depending on the level of services needed.

The company raised $8 million in a second round of funding in August 2008 from Storm Ventures and InterWest Partners, following a 2006 first round totaling $5.4 million.