http://www.freedownloadmanager.org/
I'm not interested in this, IDK if it depends on java, admin privs. or .net or anything else. But, I have seen requests for this here in the forums and just a FYI for those interested, it is now "Open source", released under released under GNU GPL. Maybe this will help someone out.
...looks awesome. Would love for someone to make it portable.
May the Shwartz be with you