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#2 Signal
Open‑source messenger with end‑to‑end encrypted voice and video calls; available on mobile and desktop.
#3 Jitsi Meet
Web‑based video conference that uses DTLS‑SRTP for encrypted media; no account required.
#4 Linphone
Free SIP soft‑phone with built‑in ZRTP and SRTP support for encrypted audio/video on all platforms.
#5 Mumble
Low‑latency, open‑source voice chat using TLS for signaling and optionally Opus‑SRTP for media encryption.
#6 Tox
Peer‑to‑peer messenger offering end‑to‑end encrypted voice, video, and file sharing without central servers.
#7 Wire
Secure collaboration suite with end‑to‑end encrypted voice, video, and messaging; free tier for personal use.
Matrix client that supports encrypted VoIP via WebRTC; end‑to‑end encryption for calls and chats.
#9 Rocket.Chat
Open‑source team chat with optional E2EE and WebRTC voice/video calls; self‑hosted for full control.
#10 Mattermost
Self‑hosted chat platform; with the free “Calls” plugin you can run encrypted WebRTC calls.
#11 Nextcloud Talk
Integrated voice/video app for Nextcloud; uses DTLS‑SRTP for encrypted media streams.
#12 Jami
Decentralized, peer‑to‑peer communication app with end‑to‑end encrypted audio, video, and file sharing.
#13 FreeSWITCH
Open‑source telephony platform; supports TLS for signaling and SRTP/ZRTP for media encryption.
#14 Asterisk
Popular open‑source PBX; can be configured with TLS/SRTP for fully encrypted VoIP calls.
Cross‑platform SIP soft‑phone; supports TLS and SRTP when the server is configured accordingly.
Business‑grade IP PBX with optional TLS/SRTP; free for up to 16 concurrent calls.
#17 SIP.js
JavaScript library for building WebRTC‑based SIP clients; can enforce DTLS‑SRTP for encrypted media.
#18 SimplePhone
Android SIP client with support for TLS signaling and SRTP media encryption.
#19 Linphone Desktop
Full‑featured desktop client (Windows/macOS/Linux) with ZRTP/SRTP encryption out of the box.
Self‑hosted Mumble server (Murmur) that enforces TLS for authentication and optional SRTP for media.
#21 Riot.im (Legacy)
Former Matrix client now merged into Element; kept here for legacy references to its encrypted calls.
#22 Signal Desktop
Desktop companion to Signal mobile; provides encrypted voice/video calls on Windows, macOS, and Linux.
#23 Briar
Peer‑to‑peer messenger with optional voice calls; all traffic is end‑to‑end encrypted over Tor or direct Wi‑Fi.
#24 Ring (now Jami)
Legacy name for Jami; still listed for users searching older documentation.
Threaded chat platform; community‑maintained plugin adds encrypted WebRTC voice/video calls.
While not end‑to‑end encrypted, Discord uses TLS for transport; suitable for casual encrypted‑in‑transit calls.
Provides TLS‑encrypted media streams; no end‑to‑end encryption but meets many security standards.
Free version offers TLS‑encrypted voice/video; not E2EE but complies with enterprise security.
#29 Zoom (Free)
Offers AES‑256 encryption in transit; end‑to‑end encryption optional for paid plans.
#30 Viber (Free)
Provides end‑to‑end encrypted voice and video calls between Viber users.
#31 Telegram (Free)
Secret chats support end‑to‑end encryption; voice calls are encrypted using MTProto.
#32 WhatsApp (Free)
Uses the Signal protocol for end‑to‑end encrypted voice and video calls.
Mobile versions of Linphone with ZRTP/SRTP; fully free and open source.
#34 Jami Android/iOS
Mobile clients for the Jami network; provide peer‑to‑peer encrypted calls without servers.