CiviCRM - A Constituent relationship management for the Civic Sector
Shopify Upsell Bundles App - Shopify app to Create Bundles, Packages and Sets with discounts by the most simple and efficient...
EspoCRM - EspoCRM is open source CRM (Customer Relationship Management) software that allows you to see, enter and evaluate all your company relationships regardless of the type.
UpSellit - UpSellit is a site abandonment platform, providing solutions and insights from the entrance page to checkout.
Pipeliner CRM - Pipeliner CRM empowers small to medium-sized sales teams to close more deals and lower risk. Implementation and training are a breeze. Mac & Windows.
ReConvert - Page builder to design thank you page that cross sell & upsell