We have listed 20 alternatives for InStream which have similar features like
InStream
including commercial, freemium, free and open source alternatives.
Vtiger CRM is online customer relationship management software that helps you track and nurture customers across marketing, sales, and customer service.
Insightly is an online CRM providing cloud-based customer relationship management (CRM) and project management tools for small and medium size businesses.
Mautic provides free and open source marketing automation software available to everyone. Free email marketing software, lead management software, etc.