mySMS is described as 'mysms Messenger is a completely free messaging service that supports texting on your smartphone, computer and tablet. mysms works cross-platform and is always free of charge. Stay connected with your friends and family no matter where they are' and is an app in the Backup & Sync category. There are more than 25 alternatives to mySMS for a variety of platforms, including Android, Online / Web-based, iPhone, Android Tablet and Windows. The best alternative is WhatsApp, which is free. Other great apps like mySMS are Hangouts (Free), Pushbullet (Freemium), Zulip (Free Personal, Open Source) and WeChat (Freemium).
WhatsApp is an iPhone and Android messaging app which allows you to exchange messages without having to pay for SMS. In addition to basic messaging WhatsApp users can create groups, send each other unlimited images, video and audio media messages.
Messages is Google's communications app for Android to helps send and receive SMS and MMS messages. You can also send group texts as well as your favorite pictures, videos and even audio messages to your contacts.
aTalk is an XMPP client that supports the following features:* Instant messaging in plain text and End-to-End encryption with OMEMO or OTR* OMEMO encryption is available during multi-user group chat session, giving users maximum privacy and security* Supports both voice...
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).