Libera.Chat is described as 'We’re excited to announce the launch of Libera.Chat, and welcome you to a next-generation IRC network for free and open source software projects and similarly-spirited collaborative endeavours' and is an website in the social & communications category. There are three alternatives to Libera.Chat, not only websites but also apps for a variety of platforms, including Mac, Windows, Linux and BSD apps. The best Libera.Chat alternative is freenode, which is both free and Open Source. Other great sites and apps similar to Libera.Chat are Ergo and synirc.
Freenode provides discussion facilities for the Free and Open Source Software communities, for not-for-profit organizations and for related communities and organizations.
synIRC strives to provide a free, safe, stable, and secure environment for internet relay chat (IRC) with minimal negative intrusion or impact from network staff.
Freenode has poor management and nobody use it anymore. Libera.chat has a very difficult process to use it so can't be accessed fast.