SightSpeed's software is free. Receiving video from the video messenger is also free, as is unlimited VoIP calling. You also get your own SightSpeed page, which lets you host video calls in your browser window. To host multiparty calls, you must subscribe to the pay-only SightSpeed Pro.
This version includes a much-improved video codec default, which produces clearer images. For a fee, PSTN outdialing is available as well. If your PC has a TV tuner card, you can now also watch a remote TV--even control the channel--with the new SightSpeedTV function.
The download link will take you to the vendor's site, where you must register to download the software.