A slimmed-down version of Eben Howard's library for dealing with grids, SquidLib, with some added features (like map generation) but with all display code removed.
'com.github.tommyettinger:cuttlebone:1.96.1'
<dependency>
<groupId>com.github.tommyettinger</groupId>
<artifactId>cuttlebone</artifactId>
<version>1.96.1</version>
</dependency>
<dependency org="com.github.tommyettinger" name="cuttlebone" rev="1.96.1"/>
"com.github.tommyettinger", "cuttlebone", "1.96.1"