[fiveturns]

I've been using Aria2 for a while now. You can run it as a daemon:

  aria2c --enable-rpc=true --rpc-listen-all=true --daemon --dir=/mnt/downloads --continue=true --max-concurrent-downloads=1 --max-connection-per-server=16 --max-tries=0 --split=16 --stream-piece-selector=geom --enable-http-pipelining=true

You can find documentation for the various options here: http://aria2.sourceforge.net/manual/en/html/aria2c.html

https://github.com/ziahamza/webui-aria2 is a decent web client. I use this to post downloads to my server at home.