I was looking for a Joomla 2.5 replacement for Section Ex too. This is real close.
A couple things that are missing here (that Section Ex had)...
Would be good to turn off Category Title links and just have them as headers. Just have the Articles linked.
Also SEO the article links to domainname.com/category/articleTitle
Thanks again for your contribution.
thanks for your review and your input.
The option to NOT link the categories is now available (version 1.7)
The links which are generated are already SEO-friendly as you can see on the demo: http://tuts4you.de/tutorials
If you have a problem with this, I would be glad if you create a post with the issue on my forum: http://tuts4you.de/forum/sectioncategoryarticlelist-support