dget
Download Debian packages.
TLDR
Download a binary package
$ dget [package]
Download and extract a package source from its .dsc file
$ dget [http://deb.debian.org/debian/pool/main/h/haskell-tldr/haskell-tldr_0.4.0-2.dsc]
Download a package source tarball from its .dsc file but don't extract it
$ dget -d [http://deb.debian.org/debian/pool/main/h/haskell-tldr/haskell-tldr_0.4.0-2.dsc]