Astian Spika is described as 'instant messaging service focused on speed, security and productivity. With great differences such as integration with Astian Cloud, support for video calls, calls among other features' and is a Group Chat App in the Social & Communications category. There are more than 100 alternatives to Astian Spika for a variety of platforms, including Android, Windows, Mac, Online / Web-based and iPhone. Most alternatives are Group , Video Calling Apps and Encrypted Chat Apps. The best alternative is Telegram, which is free. Other great apps like Astian Spika are Signal (Free, Open Source), Element (Freemium, Open Source), Jitsi (Free, Open Source) and Slack (Freemium).
Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG]. [Note] **You can download the compiled apk for free from F-Droid**: ...
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features. Use Linphone for free, and enjoy its intuitive interface and advanced features with our free SIP service or with an existing SIP account.
Utopia P2P Ecosystem. Utopia is a feature-rich platform that is specifically designed to protect privacy of communication, confidentiality, and security of personal data. Utopia is a decentralized network, with no central server involved in data transmission or storage.
Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation should be easily shared between all of your devices, not trapped as text messages on your phone.