There is opensource software out there which you can get for free. There is the client and the server. Do a search in google.
I have a copy of the software and have used it. It requires a knowldge of MySql, again this opensource and free.
The only problem with it is you are limited to a couple of tables (I havent worked out how to add extra tables yet). The one I have has 5 tables, you can put your own logo on it. The cashier system works, the back office requires some attention.
You will need to run a virtual server, on Linux. It is not easy to setup, but it is worth it once you are there.
I dont think the original poster is looking for software to run their business ? Just their poker tourney's.
The link I provided has been modded for some reason, but the software (available elsewhere - or from me, just PM me) is absolutely superb - and totally free, no spyware or crap.
Dougie.