Diigo - Diigo is a powerful research tool and a knowledge-sharing community
Flipora - flipora is a Personal Browsing History Search Engine.
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
IsYourLinkSad? - Is Your Link Sad. Make It Happy. Share your URLs to people who actually care.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
go-random.com - Go-Random is a random website search engine.