Acquisition is an off-shoot of LW, almost same code, only runs on Mac computers AFAIK.
Download Direct, Flashget & Free Download Manager are downloaders only, they do not share back; unable to seed. (I personally 'kick' every Flashget client I see. Such programs will simply kill / shorten the life of torrents by not sharing back.)

Then there's the LimeWire based part-time torrent programs that are set to only share for a certain time period or limited percentage/ratio, whichever criteria it reaches first. The default maximum period is for one day only. That comes very close to being freeloaders when you're talking about large torrent files such as videos. (Imagine this example, largest torrent I recall I have downloaded was around 125 to 140 GB in size. One day of sharing/seeding it back what % do you think LW or FW users would reach? Especially if their upload bandwidth is being used for other networks or purposes also. My guess is many would simply remove the torrent from the list as soon as they finish downloading anyway. I've seen LW & FW users downloading from public torrent sites, but I've never seen them seeding after their torrent finished downloading. And they wonder why the torrent community dislikes them.)