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DISQUS - Disqus is a global comment system that improves discussion on websites and connects conversations across the web.
Wondershare PDFelement - All-in-one PDF editor
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Commento - A fast, bloat-free comments system to foster discussion on your website
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.