I've found this very good website. Many torrents are unofficial and created by the website staff. Some torrents are official from the project maintainers.

I have been seeding torrents on me VPS for some time. Since I don't use most of the bandwidth. Now I have purchased an HDD IPv6-only VPS in the same datacenter to use as NAS and seed more torrents.

If you've got some spare bandwidth and disk space, you can seed the softwares you like.