Tox is a peer‑to‑peer, encrypted instant‑messaging and video‑calling platform that emphasizes privacy and decentralisation. Below is a curated list of 20 free instant‑messaging solutions that can serve as alternatives, ranging from open‑source clients to freemium services.
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End‑to‑end encrypted messaging app with voice/video calls, open‑source client, and strong privacy focus.
Feature‑rich client for the Matrix protocol; supports encrypted group chats, VoIP, and bridges to other networks.
Open‑source team chat platform with real‑time messaging, file sharing, and optional self‑hosting.
Self‑hosted, open‑source Slack‑like workspace offering private channels, integrations, and end‑to‑end encryption (via plugins).
Threaded open‑source chat that combines real‑time and asynchronous messaging for organized discussions.
Decentralised, peer‑to‑peer messenger and video‑conference tool with no central server.
Secure, end‑to‑end encrypted messaging and collaboration suite with file sharing and voice/video calls.
Cloud‑based messenger offering secret chats with end‑to‑end encryption, large group support, and bots.
Free tier provides text/voice channels, community servers, and screen‑share; encryption in transit.
Popular team communication tool; free plan includes searchable message history and limited integrations.
Android XMPP client with OMEMO encryption, group chat, and push‑notification support.
Multi‑protocol desktop client (IRC, XMPP, AIM, etc.) with plugins for encryption and OTR.
Peer‑to‑peer messenger designed for activists; works over Bluetooth, Wi‑Fi, or the internet with strong encryption.
Uses existing email infrastructure as a chat backend; supports end‑to‑end encryption via Autocrypt.
Low‑latency, open‑source voice chat primarily for gaming; supports encrypted connections.
Former branding of Element; still referenced in many tutorials and older installations.
Integrated instant‑messaging suite for KDE desktops; supports multiple protocols via Telepathy framework.
Lightweight, extensible Windows messenger supporting dozens of protocols through plugins.