Ring (SFLphone) is an open-source SIP-compatible softphone and instant messenger for Linux, Microsoft Windows, OS X and Android. Developed by Savoir-faire Linux
License: Open Source
Tox is a fully decentralized communication platform prioritizing privacy and offers a wide range of features, while Ring focuses on secure calling and messaging with a more user-friendly interface. Tox may appeal more to tech-savvy users, whereas Ring is designed for users seeking simplicity and ease of use.