The market for sweetly named smart-phone assistants is heating up, as Siri, Apple’s iPhone-based virtual helper, just got a new “frenemy” named Evi. Created by True Knowledge, a Cambridge, U.K.-based semantic technology startup, Evi, like Siri, can answer questions posed aloud in a conversational manner. But unlike Siri, which is only loaded on the latest iPhone, Evi is available as an app for the iPhone and phones running Google’s Android software. Read more