Use Retrospect-GDS to display your genealogy information on the web. You can change the look and feel just by creating new templates. Multiple languages are also supported. There are currently language files for English, Spanish, Dutch, German, Polish, Norwegian and French.
Retrospect-GDS is licenced under the GNU Public License. This means, that under most circumstances, you are free to use and modify this software.
Retrospect-GDS is written in PHP and can use many popular databases such as MySQL, Microsoft SQL Server, or Oracle.
Use Ged2Csv to export the information from your gedcom files into a format suitable for importing into a database. With Ged2Csv you can export to a set of delimited files which you can then import into a database, or you can choose to export directly to a Microsoft Access database.
Ged2Csv is available as shareware. You can download a full-evaluation copy which you can use free for 30 days. After the 30 day trial period expires, you can choose to purchase Ged2Csv for US$25
Ged2Csv is compatible with Windows 95/98/NT/2K/XP
If you want to code your own genealogy site, but you don't know where to start this stuff may give you a head start. phpGene is a collection of PHP scripts that you can use to create your own dynamically driven genealogy site using PHP and MySQL. These script ran infused.org for several years, but have since been replaced with Retrospect-GDS.
These scripts are offered free of charge. Feel free to copy any of the code to do with as you please. That being said, they are also offered without official support.