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Web Hosting.
The systems listed here require a web server that can run php scripts and use a mysql database. Luckily, there are hundreds of web hosts that do just that. Unluckily, there are hundreds of web hosts that do just that. And picking one can be difficult.
I recommend visiting Web Hosting Talk and looking for hosts that provide Linux hosting with a mysql database.
The script you choose may have specific requirements. Check those requirements against what your host has.