Project-knowledge base - what to do?

Question

CMS

There is a completely non-commercial task to collect a "knowledge base" (in fact, a site with several directories) on Chemistry. In general, in chemistry, not school or student. Collecting technical specifications for the project, I realized that structurally it directly resembles modern game portals - tags, different directories (years, authors, studios, genres, subgenres, signs, topics), tags, deep nesting, articles, forum part, news, galleries, and etc. Therefore, attention to the question: What are
similar projects being done on now , and what can be done on ? If there is no budget, but you need to do it
:) I will be very grateful to experts

Answer 1

wiki not working?

Answer 2

Do it on Wordpress, it's all there.

Answer 3

In general, https://www.mediawiki.org/
There are many extensions that will help to arrange the content well.