SightSpeed

SightSpeed is a videoconferencing company, supplying VoIP and instant messaging app for Windows and macOS operating systems. The service allows people to make video calls, computer-to-computer voice calls, and calls to regular telephones, with free and paid versions.

In October 2008, the company was acquired by Logitech for $30 million. The Logitech Vid service is based on SightSpeed's technology. Due to competing software, the Logitech Vid video calling service will be discontinued as of 1 July 2013 and the downloading of the product has already been terminated. As a result, Logitech is no longer accepting new account registrations.

Limitations
The main criticisms are:
 * Lack of true privacy features such as encryption.
 * SightSpeed "Phone Out" does not support outbound caller ID in the United States, where people commonly reject calls from unrecognized numbers. The recipient sees "unknown" or a blank field instead of the caller ID number.
 * Though it uses the SIP standard it is not interoperable with SIP networks and can only be used with a SightSpeed account.