Lantern now Pearl on FICS 
ICC has discontinued the older clients. Lantern for Mac, Windows and Linux was ported to FICS as Pearl Chess and users and others can continue to use it. The former iOS client as well as Android and Mac can continued to be used as Diamond The server and all software is free.
Mike Adams is the author of the app and Andrey is the main project contributer. During the first 7 or so years of the App's development Andrey acted more or less as a partner on the app. He tested every version, he contributed code and designed the modern board layout. edited the lantern manual and maintained the change log. We maintained a channel together on ICC, from 2010 to the shut down of chat in 2024. Feel free to join our Discord.
The old Manual can still be useful for documenation about the fics client in parts such as engine analysis
For those interested in my free Pulsar Engine which plays normal and variants with adjustable levels on Mac, iOS, Android, and Fire Tablets as well as Amazon Windows, see Pulsar
Our source code has been moved to https://sourceforge.net/projects/lantern-pearl/ The app is GPL.