Talkray is described as 'fast messaging and calling app. Send messages and pictures or call friends and family across the world for free over Wifi or 3G' and is an app in the Social & Communications category. There are more than 50 alternatives to Talkray for a variety of platforms, including Android, iPhone, Android Tablet, iPad and Online / Web-based. The best alternative is Telegram, which is free. Other great apps like Talkray are Signal (Free, Open Source), Skype (Freemium), Wire (Free Personal, Open Source) and WhatsApp (Free).
VideoMeeting is a free and open source video conference solution built to have video calls and chats using your web browser. It is a pure web application based on WebRTC that can provide communication features within your web browser.
Daily is an audio and video API. Easily build video chats in your web or mobile apps with an API built on top of WebRTC or drop in the Prebuilt UI for fast video conferencing integration. 1,000 person video and audio calls. HIPAA compliant.
Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
Olvid, the most secure messaging app in the world. Olvid guarantees the total and definitive confidentiality of exchanges, relying solely on the mutual trust of interlocutors. For the first time, security does not rely on trusted servers.
Lifesize Go gives you instant access to your own high-quality free video meeting space. Host meetings with up to eight participants from your phone or laptop without needing to download an application or install updates.
Skype Lite lets you send free text messages and make voice & video calls even under limited network conditions. Stay connected Skype Lite is optimized for 2G and unstable network connections, so you can stay connected with friends and family.