MinutesPlease: On MinutesPlease, you can enter a website that you visit regularly and restrict the length of time you want to spend there before getting back to work.
Quizlet: An online haven of study games and more than six million sets of flashcards, with subjects that range from German verbs to LSAT questions. The study material appears on virtual flashcards, with an option to have the content presented in the test-form or within a competitive game.
Citation Machine: “The idea is to make citing sources so easy that students get in the habit of doing it in college and after they graduate.”
