Here's a few I know of:
1. Download Express
2. Free Download Manager
3. Star Download Manager
4. Orbit Downloader
5. WinWget - http://www.cybershade.us/winwget/index.html
6. True Downloader -
http://francis.dupont.free.fr/truedownloader/
7. VisualWget -
http://khomsan.ph.googlepages.com/visualwget.home
8. wxDownload Fast - http://dfast.sourceforge.net/
9. Fresh Download
10. GetRight
11. LeechGet
Those with links, means that they are hard to get. Those without
links, just Google. First few results are your answer.
I like Download Express, but if you download too many files at
one go, you slow the PC down to a crawl.
Free Download Manager doesn't have this issue. Orbit Downloader
only has a 10 thread limit. wxDownload Fast is my all time
favourite, although it doesn't seem to be in development much.