As of 2014, Scrabble is available online at Pogo.com. You can play Scrabble on the website with other players for free using a guest account. The website does have ads and requires a personal account and profile in order to pay to play without having the ads pop up.
Other Scrabble-like games, like "Scrabble Sprint," are also available online. "Scrabble Sprint," available at Memory-Improvement-Tips.com, requires players to create words from a given set of letters within a set time limit. A player earns a higher score by creating higher-value words. Memory-Improvement-Tips.com also offers other Scrabble resources, including a word generator and a two-word list.