Anagram Thief is a real-time, web-based version of a board game called "Snatch-word" or "Anagrams."
You start with a pool of letter tiles, all face down. As you and your opponents reveal them one at a time, it's a race to take any words that appear.
Steal existing words by rearranging the letters and extending the word! For example, if your friend had the word LOG, and an A appeared in the letter pool, you could make GOAL.
Most intense when you have at least three players! No limit to the number of players, but it'll get really challenging in a big room. You can also practice on your own.