TeamViewer, founded in 2005 and headquartered in Goppingen, Germany, is a leading remote desktop and remote support software deployed on 2.5+ billion devices across 200+ countries, with a free personal edition for everyday remote assistance.
Skype is a VoIP pioneer founded in Luxembourg in 2003 and acquired by Microsoft for USD 8.5 billion in 2011, offering free audio/video calls and low-cost international calling, now being replaced by Microsoft Teams.
AnyDesk is a German remote desktop software founded in 2014, built on the proprietary DeskRT low-latency codec with a roughly 5 MB installer, supporting 10+ platforms for individual and enterprise users across 190+ countries.