Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Linker - Cloud based bookmark manager