osCommerce Templates:
osCommerce can be installed on any server that has installed PHP and has access to a MySQL database server. This includes any shared servers, dedicated servers, or even locally on any computer that uses Linux, Unix, BSD, Mac OS, and Microsoft Windows operating systems.
Great care has been taken to ensure the following:

So, your server should be able to support the powerful PHP web scripting language, as well as the fast MySQL database, and use a stable and fast Apache web server to run an oscommerce web site.

Zen Cart:

Minimum suggested server requirements: PHP 4.3.2 or higher (PHP 4.4.x for optimal performance), Apache 1.3.x and MySQL 3.2.x or higher. Register_Globals may be on or off, but safe_mode recommended to be off.

Note: Many shipping and payment modules require cURL to be installed/compiled with php.

Note: Support for HTTPS may be required depending on the payment methods being accepted. The use of SSL during account creation and checkout is recommended.
PHP 5 is not officially supported by Zen Cart at the present time; however, many shopowners are successfully running their shops on servers using PHP5.
MySQL 4.1.x uses an encryption scheme that is not 100% supported by PHP4, so may not work with Zen Cart unless you are using PHP5 ... which of course is not officially supported by Zen Cart yet.

Wordpress:

To run WordPress your host just needs a couple of things:
PHP version 4.2 or greater
MySQL version 3.23.23 or greater
We recommend Apache or Litespeed as the most robust and well-featured server for running WordPress, but any server that supports PHP and MySQL will do.Having said that, we can’t test every possible enviroment and every one the webhosts. Almost any host that meets these listed requirements will have no problems.
Here's a letter you can send to your webhost to find out their abilty to support your webpage. Please copy and paste:

I'm interested in running the open-source WordPress <http://wordpress.org/> blogging software and I was wondering if you can support the following:

Thanks!

C.R.E. Loaded:

Minimum/suggested server requirements: PHP 4.3.2 or higher (PHP 4.4.x for optimal performance), Apache 1.3.x and MySQL 3.2.x or higher.

PHP-Nuke:

To be able to use PHP-Nuke you need an SQL database server (highly tested on MySQL), Apache Web server and PHP version 4.x installed and running. PHP-Nuke runs well on the following Operating Systems:
Linux
Any Unix version
OS/2
Any Windows version
MacOS
FreeBSD

phpBB:

Installation of phpBB2 requires the following:
A webserver or web hosting account running on any major Operating System.
An SQL database system, one of:
MySQL (3.22 or higher)
PostgreSQL 7.0.3 or higher (preferably 7.1.x or 7.2.x)
MS SQL Server (7 or 2000) directly or via ODBC
MS Access (2000 or XP) via ODBC
PHP (4.0.3 and above) with support for the database that you intend to use above