Jdownloader
JDownloader is open source, platform independent and written completely in Java. It simplifies downloading files from One-Click-Hosters like Rapidshare.com or Megaupload.com - not only for users with a premium account but also for users who don't pay. It offers downloading in multiple paralell streams, captcha recognition, automatical file extraction and much more. Of course, JDownloader is absolutely free of charge. Additionally, many "link encryption" sites are supported - so you just paste the "encrypted" links and JD does the rest. JDownloader can import CCF, RSDF and the new DLC files.
http://jdownloader.org
I recently discovered this program. I don't know what the functionality was like back then compared to
now, but at this point, it seems insanely good (though I don't have experience with similar programs).
It can watch your clipboard so that merely copying a URL from a supported site means you've generated
automatable downloads of entire groups of files, like a Soundcloud album. For YouTube, it can currently download
in higher than 360p and also allows you to download audio-only versions of videos as well as subtitles for videos
(though I have yet to determine whether these are auto-generated subtitles in cases where specific ones exist).
And all I was looking for was a program I could tell to download a list of files one at a time.
(To do that, you set the maximum simultaneous downloads per source to 1.)