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#2 Skype
Classic Microsoft service offering free Skype‑to‑Skype voice, video, and instant messaging on all platforms.
#3 Google Meet
Web‑based video conferencing with a free tier allowing up to 100 participants for 60 minutes per meeting.
Popular video‑calling platform; free plan supports 40‑minute meetings with up to 100 participants.
Collaboration hub with unlimited chat, video calls, and file sharing for up to 500 users.
#6 Jitsi Meet
Open‑source, no‑account‑required video conferencing that runs directly in the browser.
#7 Discord
Gaming‑focused voice, video, and text chat with server‑based rooms; free for personal and community use.
#8 Viber
Cross‑platform messenger offering free voice and video calls between Viber users.
#9 WhatsApp
Widely used mobile app providing end‑to‑end encrypted voice and video calls.
#10 Signal
Privacy‑focused messenger with secure voice and video calling.
#11 Telegram
Cloud‑based messenger that includes free voice and video calls with strong encryption.
#12 Linphone
Open‑source SIP client for desktop and mobile, supporting voice, video, and instant messaging.
#13 Zoiper (Free)
Cross‑platform softphone that works with most SIP and IAX providers.
Full‑featured IP PBX for up to 16 simultaneous calls, free for small businesses.
#15 FreePBX
Open‑source web‑based GUI to manage Asterisk PBX, enabling free VoIP routing and extensions.
#16 Mumble
Low‑latency, open‑source voice chat primarily used by gaming communities.
#17 TeamSpeak
High‑quality voice communication platform with a free non‑commercial license.
#18 Rocket.Chat
Self‑hosted team chat with optional VoIP integration via WebRTC.
#19 Mattermost
Open‑source Slack alternative that can be extended with voice/video plugins.
#20 Tox
Decentralized, peer‑to‑peer messenger offering encrypted voice and video calls.
#21 Wire
Secure collaboration suite with free personal accounts for voice, video, and messaging.
#22 Element (Matrix)
Open network for secure messaging and VoIP; free client supports voice and video.
Free US phone number for inbound calls and SMS; integrates with Google Hangouts for VoIP.
Provides a free SIP account with a personal number for inbound/outbound calls.
Free SIP service offering inbound DID numbers and outbound calling at low rates.
#26 Ekiga
Legacy open‑source softphone for Linux and Windows supporting SIP and H.323.
#27 MicroSIP
Lightweight Windows SIP client focused on high‑quality audio calls.
#28 Grandstream Wave
Free Android/iOS SIP client from Grandstream, compatible with most VoIP providers.
#29 Jami
Decentralized, open‑source communication platform offering free voice, video, and file sharing.
#30 Talky
Simple web‑based video chat that works without registration; free for one‑to‑one calls.
Browser‑based video meetings; free plan allows up to 4 participants with no download.
Enterprise‑grade video conferencing with a free plan for up to 100 participants, 50‑minute meetings.
Online meeting tool offering free webinars and screen‑sharing for up to 3 participants.
High‑definition video conferencing platform; offers a 30‑day free trial with full features.