Amazon's (NASDAQ: AMZN) AI-powered hands-free speaker and voice assistant, Echo, is off to a great start. But soon, the e-commerce company will no longer have the space to itself. Not only did tech-giant Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL) recently introduce its own version of an Echo, called Google Home, but now a growing number of rumors point to an Echo rival from Apple (NASDAQ: AAPL), too.Amazon Echo.