Viber is a popular free Voice-over IP messaging service and Skype alternative, that can be used on your smartphone or PC.The Viber PC client takes the convenience of the mobile app and brings it to your PC so you can stay connected even when you don’t have your mobile phone.
Voice call, chat, send SMS, pictures and videos for free to any of your phone contacts who also have the app installed.
Xbox Live has two types of offerings, free and Gold Membership.
The free version gets you free game demos, game add-ons, games on demand, arcade games, avatars, and voice/text chat.
Skype Video app here provides built in capabilities for video chat.
The process in question here, skypehost.exe, is the process used by the built in Skype App and Skype Video App in Windows 10.