German startup C2Call, which offers an array of Web calling applications, said today that it has raised $2 million in its first institutional funding.

It might not seem like there’s much room for innovation in the Internet voice calling market. Skype offers a popular Web calling app, of course, but beyond that we’ve seen companies like Ribbit, which want to integrate phone capabilities into other apps. (Ribbit was acquired by BT.)

C2Call seems to stand out through its simplicity. The Dortmund, Germany company says that users of its FriendCaller app can join phone calls by simply clicking on a unique link, which can be shared on sites like Twitter or Facebook. The call occurs in the Web browser without requiring any software installation. The company also offers iPhone and Android apps.

The company was founded in 2008. Calls over the Internet are free, while landline and cell calls cost 2 cents per minute. C2Call says it has 900,000 users, and has earned $2 million in revenue since April.

The funding comes from Draper Investment Company (a Switzerland-based firm founded by famed venture capitalist Bill Draper), High-Tech Grunderfonds, and Klaus Wecken.