Knotable - Cut the noise out of busy email threads
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
LinkAce - A selfhosted bookmark manager with advanced features.
Google Keep - Capture notes, share them with others, and access them from your computer, phone or tablet. Free with a Google account.
GGather - Effortless and organized way to store and share your bookmarks with the right mix of features.