In Ireland there are both Fastpitch Softball Leagues (National) as well as Slowpitch Softball Leagues (Provincial). Softball Cups are organized on a National basis for Provincial League teams, and the Champions of each province can compete for the Softball Ireland National Club Championship (SINCC). The SINCC Champions have the opportunity to represent Ireland in the European Club Championships. In addition there have been a number of Weekend Softball Leagues for Slowpitch teams which give players and teams the chance to compete against other teams from outside their own Provincial League.
Here are links to various Softball Ireland Competitions:
Softball Business Leagues
Businesses and Corporations have been involved in Irish Softball since the first Leagues in the 1980s, with teams such as Fat Cats made up of american Businessmen. In the 1990s, Computer Companies got involved in a big way, and since the 2000s, there has been a separate Business House League or Corporate League in the Area. (see the Leinster Softball page on Eirball for more on the Leagues in the 1980s and 1990s: https://eirball.ie/leinster-softball/
The Business House League was run directly by Softball Ireland in the 2000s, and then, the Corporate League as it was now known, was run by Softball Leinster in the 2010s.