FlashGet is a leading download manager and has the highest amount of users on the internet. It uses MHT(Multi-server Hyper-threading Transportation) technique, supports various protocols and has excellent document management features. FlashGet is a freeware without any adware or spyware.
The Ubuntu ver. can be found over here: http://www.ubuntugeek.com/how-to-install-flashget-download-manager-in-ubuntu.html
