Oracle JDBC driver for Maven
This is not limited to Oracle JDBC driver, there are some JARs which are not available in the public repos. Oracle JDBC drover can be downloaded from their web site.
mvn install:install-file -DgroupId=com.oracle -DartifactId=ojdbc14 -Dversion=220.127.116.11.0 -Dpackaging=jar -Dfile=ojdbc.jar -DgeneratePom=true
If you need to add JARs in to Central Repository this Maven guide will help.