Releases are published to Maven Central.
Snapshots are published to OSSRH. To access SNAPSHOT versions, add this to your POM.
OSSRH repository
<repositories>
<repository>
<id>OSSRH-snapshots</id>
<url>http://oss.sonatype.org/content/repositories/snapshots</url>
<releases>
<enabled>false</enabled>
</releases>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
</repositories>
TODO compile a list.
Here are some more recent or possibly less known alternatives.
-
http://jscience.org/ old (java.net)
-
http://www.optaplanner.org/ modern and clean, but much larger than LP. With annotations, XML.
-
http://scpsolver.org/ Ant, not Maven. Last code modification mid-2013.