WebCull - WebCull is an ad-free, privacy-focused bookmark manager that works from any browser or device.
UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system
Reddit - Reddit gives you the best of the internet in one place. Get a constantly updating feed of breaking news, fun stories, pics, memes, and videos just for you.
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.
Survicate - Collect feedback on your website and find out more about your visitors.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.