Son of Shun
Son of Shun indexes torrents of documentaries aired on TV, cable, satellite and other networks. DVD documentaries too are sometimes indexed. However, this site does not allow any documentaries aired on subscription networks such as HBO, Showtime, etc to be indexed(with several exceptions, though).

OneBigTorrent
One Big Torrent is a public torrent tracker and a BitTorrent index which lists torrents related to Current Affairs, News, Talks, Politics, Interviews and other similar content. In addition to video documentaries and TV series, Audiobooks, E-Books and Magazines can also be found on OBT.

TorrensrMine
TorrentsRmine (TRM) is a private torrent tracker for talk shows, rare TV series and documentaries. It’s a pretty small community but TrM tracks some torrents which you cannot find even on leading TV trackers out there.

ConCen
ConCen (formerly Conspiracy Central) is a place where you can find some of the weirdest torrents on this planet. The site is based around conspiracies, conspiracy theories, secret projects, paranormal activity and many other similar topics.

ScienceHD
The content on this site can be grouped into two main categories; science fiction movies/TV shows (entertainment) and documentaries/other educational content (infotainment).

TheGeeks
Although primarily an E-Learning tracker with video tutorials, books and test engines, documentary fans will find a lot of stuff worth downloading on this tracker. In addition to educational material, it indexes infotainment content ranging from History channel documentaries, music tutorials to even magic torrents.

SonofShun URL:
http://www.sonofshun.com/forums/prof...?mode=register

OneBig Torrent URL:
https://onebigtorrent.org/user.php?op=register

TorrensrMine IRC URL:
irc://irc.torrentsrmine.org/#torrent...y?key=trminers

Concen URL:
http://concen.org/tracker/account-signup.php

ScienceHD URL:
https://sciencehd.me/applications.php

TheGeeks URL:
http://thegeeks.bz/signup.php

Enjoy ! Thanks !