OpSource, a Santa Clara, Calif. provider of application management and hosting services for online software companies, has raised a $15 million in a fourth round of financing.

The round was led by new investor Crosslink Capital, of San Francisco, with participation from existing investor Artiman Ventures, according to VentureWire (sub required).

OpSource Chief Executive Treb Ryan tells VentureWire the company may be able to go public in the next 12 to 18 months. OpSource potential risk, however is, OpSource's focus on Web 2.0 companies, many of which may be a flash in the pan. OpSource provides them with services such as hosting, storage, security and billing (see latest announcement).

The company has now raised a total of $47 million in financing from Crosslink, Artiman, Key Venture Partners, ComVentures and Intel Capital, which the last, third round. The company has also raised $8 million in debt.