Putty
Installation
Install putty. For a menu item and icon, install putty-freedesktopAUR from the AUR.
256 color support
Settings > Connection > Data : Terminal-type string = xterm-256color
To test color support, execute the following command: reference
for code in {0..255}; do echo -e "\e[38;05;${code}m $code: Test"; done
See 256colours for details.