I have tried/tested all the download managers listed on Win 7 64 with IE & Google Chrome.
Download Accelerator Manager Free - Clean interface with no craps. But limited acceleration speed i.e out of 1x - 20x speed, free version only allows 3x speed. Video Grabber never worked here. And the most important thing when you try to download something with DAM, you get a popup from windows mentioning something "this will run out of protected mode & can be dangerous". I also found it buggy like some changed settings doesn't working like I chose a different default download location but in the download info window it always showed its default download location, etc...
Download Accelerator Plus Free - Works fine. But additional softwares included. And GUI had an advert. Ultra acceleration not available in free version. It has web installer & sometimes it fails to install & gives error.
Eagleget - Works fine. Clean software with no craps.
Flareget Free - Clean software. But only 2 connection/section available in free version out of 32 if I remember correctly.
Flashget - I dont remember now but I guess doesn't works with chrome & additional softwares/craps.
Uget - If remember correctly, windows version is portable only.
Internet Download Accelerator Free - Works fine. Additional softwares, advert in download window & pro advert popup. And the same windows popup "this will run out of protected mode & can be dangerous" like in download accelerator manager.
Free Download Manager - Using from a long time on one system. Never had any probs. Clean software. One of my favourite.
DownloadNinja - New but an excellent product. Clean software & works fine. It was released in this forum here too & is improving/developing fast with support of the members here. One of my favourite.
Xtreme Download Manager - Currently testing/trying for quite some days. Improved a lot. I like it. Clean software, just 500kb installer, works fine, simple & nice interface. But not much known. So I have contacted developer & suggested to introduce himself & XDM here at MalwareTips so that he could get support & much more feedback for XDM which would be excellent for XDM development/improvement/popularity, etc... He said he is enhancing couple things in the current version & in couple of days will be here at MalwareTips. One of my favourite.