FlashGet - description from Softdepia.com:
FlashGet is specifically designed to address two of the biggest problems when downloading files:
Speed and management of downloaded files.
If you've ever waited forever for your files to download from a slow connection, or been cut off mid-way through a download - or just can't keep track of your ever-growing downloads - FlashGet is for you.
FlashGet can split downloaded files into sections, downloading each section simultaneously, for an increase in downloading speed from 100% to 500%. This, coupled with FlashGet's powerful and easy-to-use management features, helps you take control of your downloads like never before.
FlashGet can automatically split files into sections or splits, and download each split simultaneously. Multiple connections are opened to each file, and the result is the the most efficient exploitation of the bandwidth available. Whatever your connection, FlashGet makes sure all of the bandwidth is utilized. Difficult, slow downloads that normally take ages are handled with ease. Download times are drastically reduced.
FlashGet is capable of creating unlimited numbers of categories for your files. Download jobs can be placed in specifically-named categories for quick and easy access. The powerful and easy-to-use management features in FlashGet help you take control of your downloads easily.
FlashGet is a "Free to try" program. You can download and try it for an evaluation period.