I've uploaded this as a .pet here aria2-1.9.0.pet (1675kbytes), or here.aria2 is a download utility with resuming and segmented downloading.
Supported protocols are HTTP/HTTPS/FTP/BitTorrent. It also supports Metalink version 3.0. As of 0.10.0 aria2 supports chunk checksum in Metalink: it validates chunk checksums while downloading a file like BitTorrent. This gives safer and more reliable download experience.
It's a commandline program that can resume broken downloads, and has plenty of other features, including bit-torrent & metalink. to see usage, type aria2c -h in a console.
(N.B.1 The developer has a link here on how to integrate aria2c with the flashgot plugin, for mozilla browsers. It didn't work for me, but if you substituted the following script, save as /usr/bin/aria2c.sh, and give it executable permissions, replacing /root/my-documents with whatever your default download directory is, then, where the link advises Finally, enter "[FOLDER] " in "Argument template" box.[/i], ins ... -1.9.0.pet [/b](303kbytes) ), or from here.