Another alternative is https://github.com/the8472/mldht which, contrary to magnetico, strives to be a nice citizen (its author is active in the bittorrent community AFAIU)
I have worked with the8472 to get Bitmagnet's BEP5 & BEP51 implementations working and ensure it's a good citizen on the network - there is more to be done and more protocols to be implemented, but unlike Magnetico, BM is not simply scraping without responding to incoming requests.
We had a discussion here https://github.com/bitmagnet-io/bitmagnet/issues/11
With the related changes bitmagnet shouldn't have the blatant misbehavior of magnetico (anymore). Though I haven't looked at its in-the-wild behavior, so I can't vouch for how spec-compliant the implementation plays in practice.
