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UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.
JustComments - Easy to set up, ad-free and reliable comment system
DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Maker Mind - The mindful productivity newsletter ๐๐ง
RbComment - RbComment - Zend Framework 2 module for drop-in, self-hosted comments, with email notifications...
SAP PLM - SAP Product Lifecycle Management (SAP PLM) application provides you with a 360-degree-support for all product-related processes - from the first product idea, through manufacturing to product service.