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#2 Signal
Open‑source messenger with default end‑to‑end encryption, disappearing messages, and strong identity verification.
Free business‑focused version of WhatsApp with E2EE, quick replies, and catalog features for small teams.
Cloud‑based app offering optional Secret Chats with client‑side encryption, self‑destruct timers, and screenshot protection.
#5 Wire
Secure collaboration platform with E2EE for messages, calls, and file sharing; supports guest rooms for external partners.
Decentralized messenger built on Matrix protocol; provides E2EE, federation, and extensive integrations for enterprises.
Open‑source Slack alternative with optional self‑hosting; offers end‑to‑end encryption via plugins and granular access controls.
Self‑hosted or cloud chat platform with E2EE, LDAP/SSO integration, and compliance‑ready audit logs.
Threaded chat app with strong encryption in transit, optional end‑to‑end encryption, and powerful search for distributed teams.
#10 Keybase
Secure messaging combined with file storage and Git hosting; all communications are end‑to‑end encrypted.
#11 Jami
Peer‑to‑peer, fully encrypted messenger and video‑call app; no central server, ideal for privacy‑first businesses.
#12 Session
Anonymous, onion‑routed messenger with built‑in end‑to‑end encryption and no phone number requirement.
#13 Wickr Me
Free version of Wickr offering E2EE, self‑destructing messages, and secure file sharing for small teams.
Swiss‑based messenger with E2EE, no phone number needed, and strict data‑privacy laws; free tier for limited contacts.
#15 Viber
Cross‑platform chat with optional end‑to‑end encryption for private chats and public accounts for business outreach.
Free voice, video, and text platform; offers 2FA, IP‑based verification, and can be configured for private business servers.
Free tier of Teams with encrypted data in transit, secure guest access, and integration with Office 365 apps.
#18 Slack (Free)
Popular team chat with TLS encryption, optional E2EE via third‑party apps, and robust integration ecosystem.
Integrated with Google Workspace; messages are encrypted in transit and at rest, with admin controls for data retention.
#20 Tox
Decentralized, peer‑to‑peer messenger with built‑in E2EE for text, voice, and video; no servers to compromise.
#21 Briar
Secure messenger that works over Bluetooth, Wi‑Fi, or the internet; uses end‑to‑end encryption and no central servers.
#22 Olvid
Zero‑knowledge messenger with E2EE, no phone numbers or email required, and automatic forward‑secrecy.
#23 ChatSecure
iOS‑only XMPP client with OTR encryption, perfect for businesses needing a native Apple solution.
#24 Conversations
Open‑source XMPP client for Android with OTR and OMEMO encryption, supporting multiple accounts and group chats.
#25 Xabber
Lightweight XMPP client offering OTR/OMEMO encryption, multi‑account support, and a clean UI for Android.
Cross‑platform desktop messenger; add the OTR plugin for end‑to‑end encrypted chats over XMPP, IRC, etc.
#27 Zoho Cliq
Free tier provides encrypted chat, file sharing, and integration with Zoho suite; suitable for small businesses.
#28 Flock
Team messenger with TLS encryption, optional E2EE for private chats, and built‑in productivity tools.
#29 Ryver
Free plan includes secure messaging, task boards, and voice calls; data encrypted in transit and at rest.
#30 Bitrix24
All‑in‑one collaboration suite; free tier offers encrypted chat, video calls, and robust permission settings.
Open network for secure, decentralized communication; reference client provides E2EE and federation.
Deployable on-premise chat with optional E2EE, LDAP/SSO, and compliance‑ready logging.
Cloud‑hosted free tier with optional E2EE via plugins, role‑based access, and audit trails.
Browser‑based Matrix client offering E2EE, SSO integration, and granular room permissions.