3CX
Description: 3CX is an open-source IP PBX software solution that works with popular SIP phone systems. It offers unified communications features like auto attendants, call routing, voicemail, video conferencing, and more.
Type: software
Pricing: Open Source
Yahoo! Messenger
Description: Yahoo! Messenger is an instant messaging client and associated protocol provided by Yahoo!. It allows users to communicate in real-time through text, voice, video chat, and file sharing. Popular in the early 2000s, it has since declined in usage with the rise of smartphones and other messaging apps.
Type: software