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Top Competitors to Consider
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#2 Jitsi Meet
Web‑based, open‑source video conferencing platform with end‑to‑end encryption; works in any modern browser or via the desktop client.
#3 Linphone
Cross‑platform SIP softphone (Windows, macOS, Linux, Android, iOS) with voice, video, and instant messaging support.
Lightweight SIP and IAX client for Windows, macOS, Linux, Android and iOS; free tier includes basic calling and messaging.
#5 MicroSIP
Compact, portable SIP softphone for Windows that uses the PJSIP stack; supports HD audio and video.
#6 Mumble
Low‑latency, open‑source voice chat for gamers and teams; uses its own encrypted protocol rather than SIP.
#7 Tox
Decentralized, peer‑to‑peer messenger with secure voice and video calls; no central server required.
Free, open‑source, distributed communication platform offering voice, video, and file sharing without a central server.
SIP softphone from CounterPath with HD audio/video, call recording, and integration with popular CRMs.
Feature‑rich, on‑premise PBX that includes a free SIP softphone for Windows, macOS, iOS and Android.
#11 Twinkle
Open‑source SIP softphone for Linux with a simple UI, call transfer, and conference capabilities.
#12 QuteCom
Cross‑platform SIP client (Windows, macOS, Linux) offering voice, video, and presence.
#13 SIPDroid
Android SIP client that integrates with the native dialer, supporting voice calls over Wi‑Fi or mobile data.
#14 CSipSimple
Android SIP client with support for multiple accounts, call encryption (ZRTP), and integration with the native phone UI.
#15 Grandstream Wave
Free SIP softphone for Android and iOS, offering HD voice, video calls, and push‑notification support.
#16 PhonerLite
Windows‑only SIP client with a clean interface, call recording, and support for multiple accounts.
Legacy free version of CounterPath’s softphone; provides basic SIP calling and instant messaging.
Former open‑source SIP client for Linux, Windows and macOS; merged into the Jami project.
#19 FreeSWITCH
Open‑source telephony platform that can act as a softphone gateway; includes sample client applications.
#20 Asterisk
Widely used open‑source PBX; while primarily a server, it ships with softphone utilities and integrates with many free clients.
Separate from the mobile app, this desktop‑only client offers advanced video codecs and screen‑sharing.