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#2 Zoom
Free video‑conferencing client with high‑quality audio, screen sharing, and unlimited 1‑to‑1 voice calls.
Microsoft’s collaboration hub offering voice calls, chat, and file sharing without a paid licence.
#4 Discord
Gaming‑focused platform that provides free voice channels, group calls, and screen sharing.
#5 Skype
Classic Microsoft VoIP client with free unlimited 1‑to‑1 voice and video calls.
Open‑source, encrypted video‑conference client with no account required; works as a native desktop app.
#7 Linphone
SIP‑based softphone with HD audio, video, and instant messaging; fully open source.
#8 Mumble
Low‑latency, open‑source voice chat designed for gamers; supports encrypted communication.
#9 TeamSpeak
High‑performance VoIP client popular in gaming; free client with optional paid server hosting.
#10 Viber
Cross‑platform messenger with free voice and video calls, plus end‑to‑end encryption.
#11 Signal Desktop
Privacy‑first messenger offering encrypted voice calls; syncs with the mobile Signal app.
#12 Telegram Desktop
Secure messaging app that includes free voice calls and group voice chats.
#13 Wire
Business‑grade, end‑to‑end encrypted communication suite with free voice and video calls.
#14 Element (Matrix)
Open‑source Matrix client offering encrypted voice/video calls and persistent chat rooms.
Self‑hosted chat platform with built‑in voice call support via WebRTC.
#16 Zoiper (Free)
Feature‑rich SIP softphone with HD audio, video, and call recording; free tier available.
#17 3CX Desktop App
Free softphone for the 3CX PBX ecosystem; supports SIP, video, and instant messaging.
#18 Ekiga
Legacy open‑source VoIP and video conferencing application supporting SIP and H.323.
#19 Jami
Decentralized, peer‑to‑peer communication tool with free voice, video, and file sharing.
#20 Tox (uTox)
Fully encrypted, peer‑to‑peer messenger with voice and video calling; uTox is a lightweight client.
#21 QuteCom
Open‑source SIP client with a clean UI, call recording, and contact management.
Multi‑protocol instant messenger; add the 'Voice and Video' plugin for SIP/Skype calls.
Free conference‑calling service with a dedicated desktop client for audio meetings.
#24 Ventrilo
Lightweight voice chat client popular with gaming communities; free for personal use.
Desktop client for the Mumble server (Murmur); offers low‑latency, encrypted voice chat.
#26 Talky
Simple, browser‑based video/voice chat that also offers a lightweight desktop wrapper.
Cloud‑based phone system with a free desktop client for unlimited internal calls.
Google’s video‑conference service; can be run as a native app via Electron wrappers (e.g., ‘Google Meet Desktop’).
#29 Slack (Free)
Collaboration hub with free voice and video calls for up to 15 participants.
Open‑source Slack alternative; with the WebRTC plugin it supports free voice calls.
#31 MicroSIP
Lightweight SIP softphone for Windows; macOS users can run via Wine or use the companion app.
Separate beta builds for macOS offering the same SIP features as the main Linphone client.
Legacy open‑source client supporting SIP, XMPP, and video calls; still maintained for legacy use.
Open‑source PBX system includes a free softphone client for Windows/macOS.