FreeSWITCH is a free and open source application server for real-time communication, WebRTC, telecommunications, video and Voice over Internet Protocol (VoIP).
License: Open Source
Zent.IO excels in providing a user-friendly and customizable communication platform suitable for diverse integrations, while FreeSWITCH offers a powerful and scalable open-source solution tailored for advanced telephony applications. The choice between them depends largely on the specific needs for ease of use versus telephony capabilities.