Numbers Station is described as 'Secure messenger that protects against NSO Group (Pegasus) & Cytrox (Predator) from exploiting your iOS device via "zero-click" exploit chains. These exploits are easily delivered via other messaging apps like iMessage, Signal, WhatsApp, etc. Protection for those at the highest risk' and is a instant messenger in the security & privacy category. There are more than 10 alternatives to Numbers Station for a variety of platforms, including Android, iPhone, Windows, iPad and Linux apps. The best Numbers Station alternative is Signal, which is both free and Open Source. Other great apps like Numbers Station are Telegram, Element, Matrix and Tox.
LINE is transforming the way people communicate, closing the distance between family, friends, and loved ones for free.
ChatSecure is a free and open source messaging app that features OTR encryption over XMPP. You can connect to your existing accounts on Facebook or Google, create new accounts on public XMPP servers(including via Tor), or even connect to your own server for extra security.
Session is the world's first open-source, decentralised private messenger to use industry-leading Signal Protocol encryption — without asking for your phone number.
WeChat is a complete mobile communication and private social networking app. Free, cross-platform, and full-featured, WeChat is the best way to keep in touch with everyone you care about.
Selene is a comprehensive peer-to-peer chat and file sharing application built on the Tor network. It enables secure, private communication and seamless file transfers between users, leveraging the anonymity and resilience of Tor.
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