Aria2 is, as far as I know, the only one portable software able to deal with Metalink & Bittorent.
If you have a software and want to be able to deal with Metalink, aria2 is IMO a good candidate.
The problem, is that aria2 is not available as a library. So although it's great, it's not easy to reuse the code.
We all want to spread the Metalink use, but as long as we do not have a lib to do that, this really won't happen I think.
Why not providing a libaria2 library?
first version implemented available in the git master branch.
Thank you!