The TrueConf video conferencing solution is designed for OS X 10.7 and older versions. It provides video conferencing calls for the corporate video network TrueConf Server, as well as the cloud video conferencing service TrueConf Online.
Russian-based soft-codec VTC manufacturer TrueConf has had a desktop VTC system application that was capable of connecting Windows and Android users together for a while. Now it's MAC OS and iOS capable too.