If you tell me, it will help me a lot, I will thank you
Please elaborate, what do you mean?
The blue "Official" box is only for stuff maintained by Vanilla Forums staff and core team.
I think the OP wants a plugin that would allow the OP to host downloadable items like the official addons page on here.
The OP wants the design and the functionality of the addons page.
Something like addonHostPage.zip