The Turbine Download Manager (TDM) uses a proprietary P2P scheme which is similar to Bit-torrent, but different, and NOT compatible with it.
It started out supporting only LOTRO about 18 months ago, and was expanded to support DDO recently.
One fairly extensive description is here.
http://lorebook.lotro.com/wiki/Turbine_Download_Manager
Note that it requires .NET Framework 2.0 and .NET Framework SP1
There is/was a useful FAQ on the support machine which has not been up since at least earlier today.
turbine.fuzeqna.com ... which is a hosting company... even though it is an official turbine link off the LOTRO Forum home page.
http://turbine.fuzeqna.com/lotro.support/consumer/kbdetail.asp?kbid=1981&SearchType=advanced&referrer=&CustID=&rfield=&usertype=&formaction=search&bUseEditor=&IncludeHTML=&gpn=&gpv=&keyword=download+m
I believe that document (if it still exists) tells who actually wrote it. It may also still be in the TDM client.
(I used TDM back in its beta days and gave up on it since I had the DVDs and it was pretty buggy back then, and unistalled it.
I only used it to download the LOTRO and DDO music.)
There is a TDM forum section on the main LOTRO forums...
http://forums.lotro.com/forumdisplay.php?f=214
Knew I would find this eventually...
The DDO Support section still identifies the downloader as Pando.
"This download uses Pando Media Booster to download the installation files for installing DDO."
http://www.ddo.com/component/content/article/455-downloadinstall-ddo
I also found this posting by one of the Turbine Devs...
http://forums.lotro.com/showthread.php?t=289656
We use two completely different systems for downloads of LOTRO, each of which has their own P2P network:
Turbine Download Manager, which uses a tiered download system that will get players into the game quickly. High resolution game data is always included with TDM.
Pando downloaders, available in standard and high resolution flavors.
If you visit this page, you will see links for three different LOTRO download options.
http://www.lotro.com/support/download-lotro
http://www.pandonetworks.com/media-booster