Folx is a download manager for Mac. It boasts the ability to split downloads in threads, resume interrupted downloads, efficiently manage and organize downloads, etc. It has a handy file-management system that allows finding any file you downloaded with Folx at lightning speed. Tagging downloads adds to the convenience of Folx: you can assign a tag--or several tags--to each download task, and easily find them whenever you need them, even if they were downloaded ages ago.
The Pro version allows you to schedule downloads and to define the exit behavior when downloading is finished: system shut down, switch to sleep mode, or quit Folx; control the download speed; split downloads into as many as 10 threads for even faster downloading experience; and to add the downloaded music and videos to iTunes playlists automatically.