I am thinking of switching over to XOOps after seeing another site using it.

I was wondering, what if any is the forum software installed?

Is there any mods for Sub-forums.

How easy is itto port forum mods from the stand alone version to the XOOPs?

How harsh is XOOPs on ones database?

Welcome to XOOPS, Hikaru.

In it's current form, XOOPS is a stand-alone Content Management System that gives you the ablilty to choose what modules you want to have available on your site.

XOOPS has a wide variety of modules for different purposes. Among them are news/article modules, photo galleries, links, download, and forums. You'll find a categorized list of modules on this page: https://xoops.org/modules/repository/

New modules and updates to existing modules are announced on the XOOPS homepage and in this section: https://xoops.org/modules/news/index.php?storytopic=2

There are a few forum modules available: https://xoops.org/modules/repository/viewcat.php?cid=20

This seems to be the most popular one: https://xoops.org/modules/news/article.php?storyid=2851

You can create subforums with all of them as far as I know.

Regarding porting forum mods, do you mean that you already have a forum and you want to copy its posts to a XOOPS forum module?

Database usage will really depend on what type of site you're running, how many concurrent users...., but I can honestly tell you that database loads has never been a big problem for me on any of my sites.

Hopefully, you'll feel that XOOPS has what you're looking for.

gestroud

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With the standalone phpbb you had to add a mod (modification) to have the ability to create subforums.

For example on my site I have it like this

Toyota (Catergory) >> Midsize (Catergory) >> Camry (Forum)

Is that the same with the forum mods avaibale?

What forums is this site running?

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What I mean by porting a mod is taking a mod (modification made for the standalone version of the module and making changes so that it works with XOOPS version, see my example above about Subforums.

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I have several sites running variants of PHP-Nuke and they all put a huge strain on the database sever, sometimes even causing it to time out. And this is with only 50 users on one site.

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Newbb - which is the older version of the CBB module (the latest release is 3 of this, version 3.01 is due out shortly.
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Xoops has an extensive Caching system, which when set up properly will lighten the load on a Database.

It can take some experimenting to get the settings how you want them, but it makes a large difference on the load.