axel is a command-line utility, similar to
wget. In fact,
axel can be substituted for
wget for the most part, sans the additional options it provides (and vice-versa).
It can be installed on OS X through
brew install axel
An anecdotal example seen in the screenshots below.
axel downloads a
11.38 GB file at a rate of
56.46 MB/sec, compared to
27.3 MB/sec with
wget. Of course, depending on numerous different factors, there may be little difference between the comparative download speeds, or even the opposite pattern.
It certainly does not hurt to have both tools in your toolkit! See also details of package axel on debian.org.