The Site Software interface allows you to add, manage, upgrade, and remove cPAddons (cPanel Addons). cPAddons are software packages that add useful functions to your website. For example, cPAddons can run blogs, bulletin boards, ecommerce, guest books, and other services.
Your hosting provider selects which cPAddons are available to you. If you need an additional cPAddon for your website, contact your hosting provider.