The MindMeld iOS SDK by Expect Labs is a set of development tools that enable developers to add voice-driven search to their iOS application. The most important functionality of this SDK is found in the MMApp Object, as most calls and requests are made from here.
Talkray is a mobile application created by TiKL, a company also known for its TiKL Touch To Talk walkie-talkie application for Android and iPhone. Talkray is the company's broader communications app that allows users to make phone calls as well as send and receive text messages and photos. Talkray's API makes it possible for developers to add things like voice calling and text chats to their applications.
Agora.io has launched an Agora Interactive Broadcasting API developers can use to add real-time interactive broadcasting capabilities to web and mobile applications. Agora Interactive Broadcasting supports up to 7 active speakers and 10,000 participants, and is available via the Agora SDK.