Yaaic is as the full name (Yet Another Android IRC Client) already says an Internet Relay Chat (IRC) client for Android devices. Yaaic is available at Google Play.
Yaaic is free and open source! Grab the code on GitHub.
Android Zeitgeist - Android Developer Blog
Lands of Ruin
Are you into tabletop gaming? Take a look at Lands of Ruin, a tabletop strategy game I am also working on. It's played with an Android companion app.