Our API directory now includes 73 voice APIs. The newest is the Ivona API. The most popular, in terms of mashups, is the Twilio API. We list 340 Twilio mashups. Below you'll find some more stats from the directory, including the entire list of voice APIs.
Lyft is launching a developer program of its own in order to better compete with Uber. Lyft's first partner in this new endeavor is Facebook Messenger. Lyft hopes the program will eventually expand to see a wide number of developers add Lyft-hailing buttons to their own apps.