For Linux, a lot of download manager is available, but i choose multiget as good download manager for my Linux Mint 9.0 Isadora.

Multiget
Multiget is a free and open source download manager with easy to use and decent graphical user interface.Multiget is developed using c++ and it is a cross platform application (available for Linux/Windows/BSD/MacOS).

Features of Multiget Download Manager

• Supports for FTP/HTTP protocols.
• Supports multithreading on multi server.
• Resume downloads.
• Security by using proxy as it supports SOCKS 4,5 proxy,http proxy and ftp proxy.
• Supports P2SP(Capability of combining different files downloaded from multiple servers)

How to Install Multiget Download Manager
It can be installed in few clicks using synaptic package manager. Go to synaptic package manager and search for multiget then click on install. Enter your administrator password ;then installation will begin. You can start it from Applications->Internet->Multiget.

Or you can download and install it mannualy from its afficial site.
Download Multiget