Ekiga is an open‑source softphone for Linux and Windows that supports SIP and H.323 protocols. If you’re looking for other free VoIP clients or platforms that provide voice/video calling, instant messaging and conference features without licensing fees, the list below offers twenty solid alternatives.
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Web‑based, open‑source video conferencing platform with end‑to‑end encryption; works in any modern browser or via the desktop client.
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.
Compact, portable SIP softphone for Windows that uses the PJSIP stack; supports HD audio and video.
Low‑latency, open‑source voice chat for gamers and teams; uses its own encrypted protocol rather than SIP.
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.
Open‑source SIP softphone for Linux with a simple UI, call transfer, and conference capabilities.
Cross‑platform SIP client (Windows, macOS, Linux) offering voice, video, and presence.
Android SIP client that integrates with the native dialer, supporting voice calls over Wi‑Fi or mobile data.
Android SIP client with support for multiple accounts, call encryption (ZRTP), and integration with the native phone UI.
Free SIP softphone for Android and iOS, offering HD voice, video calls, and push‑notification support.
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.
Open‑source telephony platform that can act as a softphone gateway; includes sample client applications.
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.