portal website

Hi,

If you are looking at Open Source Web Portals you may try these.

Joomla
Drupal
Mambo

These are some of the Best Free Open Source CMS (Content Management System). We would suggest you try Joomla as it is easy and powerful.

Thanks and Regards,
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The fact is, there are tons. You can see some reviews and examine a large list of content management systems on CMS Critic.

What specific features are you looking for in a portal?

Wordpress can be customized as a portal web site.

Joomla, Drupal, Mambo, WebsiteBaker, are just few examples of feature rich but complicated open source CMSes.

if you are newbie then go for wordpress
if you are intermediate Joomla...

these 2 are most common CMS so most of us can help you with it...
more help hit me PM