TrueDownloader   is a open source download manager/accelerator with good features like Pause/Resume downloads, simultaneous downloads, segmented downloads for acceleration.
Both HTTP and FTP protocols are supported , and it's very fast ! You can even improve it or adapt it to your needs since it's open-source. Some special features like HTTP/FTP Proxy support and ZIP previewing are supported too.

Features:

· TrueDownloader - Downloading as fast as other professional programs like DAP, or GetRight !
· Simple, Reliable, No banner or advertisement !
· Can be used for HTTP or FTP internet download !
· Compatible with all webservers !
· Multi Langugage supported !
· Integrated in Internet Explorer, Mozilla, FireFox and their derivatives.

Download: TrueDownloader 0.831 Preview 2 (182 KB) | TrueDownloader 0.82 (2.6 MB) | Screenshot | Homepage