Composer

Install

curl -sS https://getcomposer.org/installer | sudo php -- --install-dir=/usr/bin --filename=composer

Add a custom packages repository

composer config --global repositories.example composer https://packages.example.com/

Install composer package from a local folder

mkdir -p ~/composer-packages/
cp vendor-module-x.x.x.zip ~/composer-packages/
cd ~/public_html/
composer config repositories.local artifact ~/composer-packages/
composer require vendor/module
#or
composer update vendor/module