Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
skribbl - Word guessing based on drawing.
SkyBucket - Save and manage all your bookmarks on one board
LetsDraw.It - Guess and Draw, Drawing Battle, Pictionary, Copy picture - online drawing games where you can compare your skill with others.
Siimpl Bookmarking - Start collecting and organizing what interests you
gartic.io - Draw, guess, and win!