What is the crowd's opinion of Hydrus?

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Funny you mention that, an imageboard user made a media manager + scraper called Hydrus that allows for a public, collaborative, anonymous tagging system.

I tried it a while back, and was pleasantly surprised how many of my random images were already tagged. A tad unstable, though.

It's not specifically for that purpose, but there's a program called Hydrus that has a thread watcher specifically for downloading images. Pretty easy to setup.

http://hydrusnetwork.github.io/hydrus/

Technically you can use Hydrus and its tag repository server for this. Import all photos into hydrus, configure it to connect to your tag repository and give a copy of this client to everyone. Now everyone can tag files in their own copy of Hydrus and send their tags to tag repository where you can review them and choose which ones will be sent back to all clients.

There's also a Philomena

The problem with most feature-rich booru engines is that they are pretty heavy on server resources and/or rely on external services (such as AWS) to function properly.

If you are setting it up for yourself then Hydrus + Hyve might be a better choice than any booru engine thanks to a pretty big community which creates download scripts for it.

which "rule34" page have you been scraping? you don't specify the site you've been targeting?

There is little point in seeding a static archive as a torrent, since it will be obsolete very quickly as the real site is still active and users upload to it constantly.

Might look into Hydrus maybe?

Definitely.

Hydrus can also be set up to pull tags from many gallery sites automatically when you download an image from them.

The UI is kinda hard to get into at first. I find it makes a lot more sense when you think of its "Pages" as "Workspaces" or "Workbooks"

Look here