Mac OS X Softwares to Audio Calling

TeamViewer is a premier remote access, support, and online collaboration software. It provides secure connections to computers and mobile devices from anywhere in the world, enabling IT professionals and individuals to provide remote support, access files, attend online meetings, and collaborate effectively across distances.

iTeleport VNC is a versatile remote desktop access solution enabling users to connect to and control computers from anywhere. It acts as both a VNC client and server, offering features for file sharing, monitoring, and unattended access across multiple platforms.

Dualmon is a robust and free remote desktop and remote support software designed for a wide range of users, from individual tech support to large enterprises. It provides secure and efficient remote access, screen sharing, file transfers, and various administrative tools for managing remote computers and servers.

Remobo was a network utility that created an Instant Private Network (IPN) between users, allowing them to connect and interact over the internet as if they were on the same local area network (LAN). It facilitated remote desktop access, file sharing, and communication.

ConnectWise Control, formerly ScreenConnect, is a robust self-hosted remote support and access solution designed for businesses of all sizes. It provides secure, fast, and flexible remote control capabilities, enabling IT professionals to troubleshoot issues, perform maintenance, and manage systems remotely.

Psi is a robust, open-source instant messaging client built on the XMPP protocol. It's known for its focus on speed, efficiency, and adherence to XMPP standards, offering a clean interface and strong privacy features for secure and reliable communication.

Pidgin is a free and open-source multi-protocol instant messaging client designed to connect users across various chat networks with a single application. It's highly extensible through plugins and supports a wide range of protocols including XMPP, ICQ, and IRC.