I didn't know about this centralized list of projects.
It must indeed be a big problem to keep it up to date all by yourself. There are so many different projects. I even built my own little tool recently, and I'm no developer at all.

I've created a blog a while ago to sum some up with the idea to keep it updates, but a dedicated website is better.
@friendlymoose/a-broad-collection-of-hive-tools-apps-and-games

New games are popping up every week, just check Snaps to see that.
On the other hand, many projects also stop. I noticed a few dead links on your site.

I think it is hard to keep it up to date and make it decentralized. Maybe you could make it more like a Wiki, so people could add their own projects and others could remove projects that have ended.