Download Accelerator is a free and open source software application that allows quickly downloading of files on the web.
Download Accelerator contains two parts. This part which downloads files and another part which is a firefox extension. Indeed if you want to benefit all fonctionalities of this application you must install the two parts.
You can launch it from command line by typing "downloadaccelerator", from desktop activities by clicking to its icon and from web browser firefox if you are installed its extension.