File Centipede is the best Linux download manager.
It's the only one that supports all mainstream protocols and the video sniffer's Linux download manager.
It also contains tons of auxiliary tools like file-merge, checksum, base64-encoder, URI-encoder, and magnet-to-torrent......
You can also use it to manage remote files like WebDAV, FTP, and SSH.
It's very easy to install, only need one click, and it has no other dynamic libraries requirement, even Glibc.