HiHera is another site that allows us to create our own forum for free, without installing any script and in addition to hosting included, so you do not have to worry about anything more than to have to create content. This site offers unlimited bandwidth, unlimited space, updates, mods or hacks to our forum, technical support and also promise a 99.9% uptime so that the benefits seem good at first glance.

I'm not sure what kind of script used, appears to be an altered by them, which is very similar to phpBB, easy to use and the interface is almost identical. The only advertising that is displayed is at the foot of the page and contains a banner HiHera with a link to sign up, and as far as I've seen is all you get for advertising on forums.

Link | HiHera