I have found some geneology tools that are free and would install real easy on your site.

All of these look great - for different reasons.

http://ancestorforest.com/software/

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PhpGedView is a revolutionary genealogy program which allows you to view and edit your genealogy on your website. PhpGedView has full editing capabilities, full privacy functions, can import from GEDCOM files, and supports multimedia like photos and document images. PhpGedView also simplifies the process of collaborating with others working on your family tree. Your latest genealogy information is always on your website and available for others to see.

PhpGedView is an Open Source project created by people from around the world freely donating their time to work on the project.

http://phpgedview.sourceforge.net/index.php

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TUFaT  version 2.8.0 $5.00 - almost free

Create your family tree online, and let your family members all over the world add to it. Includes dozens of viewing options and administrative controls, import/export capabilities, image galleries, dynamic templates, and many more features.

http://www.tufat.com/script1.htm

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