The Zendesk Zopim Android SDK by Zendesk allows to embed live chat between users and agents, leave offline messages when representatives are not available, send and receive files, provide feedback, and e-mail a transcript of the conversation. See more of the Zendesk Chat properties at https://fast.wistia.net/embed/iframe/z07jgq4w96?popover=true
Twilio has released a beta version of its Conversations API. The unified API allows developers to aggregate messages across channels (SMS, MMS, Chat, and WhatsApp) into a single conversation. Additionally, administrators can control the conversation and supplement with experiential features.
Microsoft has joined the likes of Google and Mozilla with its release of the WebRTC 1.0 API. The release enables real-time audio, video, chat, and file sharing across platforms and browsers. With the first release, Microsoft is focused on delivering RTC functionality in existing, legacy websites.