sIRC is a simple general purpose IRC library for Java.
Version 1.5.5 of sIRC has been published on Maven:
<dependency> <groupId>com.sorcix</groupId> <artifactId>sirc</artifactId> <version>1.1.5</version> </dependency>
I have switched to Go for personal projects, and do not spend much time on sIRC anymore. While this wasn’t a problem in the past, the IRCv3 working group has been adding new features to the old IRC protocol. Unless someone else is willing to spend the time, these probably won’t be added to sIRC. I suggest taking a look at the wonderful PircBotX library if you need more support.