You can install the latest version of GNU/WGET and many other open source software without using Homebrew or MacPorts.

The steps are as follows:

Prerequisite

You need to install a free app called Xcode.

It includes command line development tools such as gnu/gcc and friends

Steps for the installation

1. Step #1: Download gnu/wget source code

Use curl command as follows to download the latest gnu/wget from the official project site.

Open the Terminal and than type the following commands:
$ cd /tmp
$ curl -O http://ftp.gnu.org/gnu/wget/wget-1.15.tar.gz
$ ls -l

2. Step #2: Extract files

Use the tar command to extract files on OS X as follows:
$ tar xvf wget-1.15.tar.gz

3. Step #3: Configure, Compile and Install GNU/wget on OS X

First, cd to the wget-1.15 directory using cd command:
$ cd wget-1.15