uGet Download Manager is a free, open source download manager available for Linux, Windows and also Mac OS X. For Ubuntu users, you can install the most recent version of uGet download manager via PPA repository.
uGet Download Manager PPA for Ubuntu 14.04 and its derivatives
sudo add-apt-repository ppa:plushuang-tw/uget-stable
sudo apt-get update
sudo apt-get install uget
Make sure you have this PPA set up on your Ubuntu 14.04 to stay updated every time new version of uGet is available.
Source: uGet website