It would be really great if you could use a Database Category menu on the sidebar .... 

Would be a great way for people to discover things.

Is there anything like that in the Marketplace anyone has come across?

 

Not sure I understand the question. You can put the Database Category widget in the sidebar. But you want to put it somewhere else, like the forums for example?

I suspect he means "on any other sidebar and not only the page which features the database itself".

It sounds somewhat confusing. After all, it is a submenu, not a content discovery tool. And it’s a global feature, which also appears as submenu in other areas, e.g. here: https://invisioncommunity.com/files/

I can't see why you wouldn't want a block on the forum sidebar with a menu that took you to the Articles by category.

 

Did you ever resolve this as it is exactly what I need as well.

I have so many sections that I have grouped some of them together so my main menu item for say "Resources" goes to a Resources page which is the landing page (home page) for 4 different sub sections of my site - for example the Files section, a Tools and Calculators database, a Tutorial database and another database. On my Resources landing page I also have widgets showing the last few entries of each of the different 4 sections to show a taste of each of them. So it would be good to have a category menu block in the right column for each of these database sections and 1 for the Files section as a type of menu for the user to go straight to a category.

Each of the 4 sections do come up as a sub menu of the landing page as well