Documents Seller is a Joomla Files Selling extension allows you to sell your downloadable products.
EDocman is a powerful Joomla Documents Management / Files Download extension.
Events Booking is a powerful Joomla Events Registration / Events Booking extension.
Joom Donation allows you to get Onetime and Recurring Donation donations on your site.
Membership Pro is a powerful Joomla Membership / Subscription extension.