Lightfall Client
This client-side mod is specifically designed to provide compatibility with Lightfall servers that use a custom connection protocol. When attempting to join such a server, you'll see a special screen displaying the connection establishment status.
It's important to note that this mod doesn't add any new game content - its sole purpose is to enable connection to servers running on the Lightfall platform.
Lightfall is a fork of Waterfall with support for modern Forge versions. More details about the project can be found on the developer's page.