BlackArch Linux is an Arch Linux-based distribution for penetration testers and security researchers. The repository contains 1410 tools. You can install tools individually or in groups. BlackArch Linux is compatible with existing Arch installs.

# Run https://blackarch.org/strap.sh as root and follow the instructions.
$ curl -O https://blackarch.org/strap.sh
  
# The SHA1 sum should match: 86eb4efb68918dbfdd1e22862a48fda20a8145ff
$ sha1sum strap.sh
  
# Set execute bit
$ chmod +x strap.sh
  
# Run strap.sh
$ sudo ./strap.sh

You may now install tools from the blackarch repository.

# To list all of the available tools, run
$ sudo pacman -Sgg | grep blackarch | cut -d' ' -f2 | sort -u
 
# To install all of the tools, run
$ sudo pacman -S blackarch
  
# To install a category of tools, run
$ sudo pacman -S blackarch-<category>

# To see the blackarch categories, run
$ sudo pacman -Sg | grep blackarch

As part of an alternative method of installation, you can build the blackarch packages from source. You can find the PKGBUILDs on github. To build the entire repo, you can use the blackman tool.
# First, you must install blackman.

If the BlackArch package repository is setup on your machine,

# you can install blackman like:
$ sudo pacman -S blackman

# Download, compile and install package:
$ sudo blackman -i <package>
 
# Download, compile and install whole category
$ sudo blackman -g <group>
  
# Download, compile and install all BlackArch tools
$ sudo blackman -a
  
# To list blackarch categories
$ blackman -l
  
# To list category tools
$ blackman -p <category>                                 

# Install blackarch-install-scripts package
$ sudo pacman -S blackarch-install-scripts
  
# Now, you can run and follow the instructions
$ sudo blackarch-install 

Download BlackArch Linux v2016.04.28