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wget personally feels the best

http://askubuntu.com/questions/47628/good-download-manager-for-ubuntu
http://askubuntu.com/questions/32850/what-download-managers-are-available-for-ubuntu

Command line tools for multi-thread downloading include axel, aria2, etc. Just use apt to install them.

If you want a graphical interface, you can use the Firefox extension DownThemAll.

aria2 and then add a web management interface, awesome

Wget, Curl, aria2 three models! Graphical uGET can support the latter two!