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CallsZoiper
Free

Free and open source under the GPL-3.0-or-later.

 Freemium

Free softphone, with paid versions sold on the Zoiper site.

Linux Windows, macOS, Linux, Android, iOS, Browser extension
  • Handles both cellular and SIP calls
  • Integrates with the GNOME desktop
  • Native apps on desktop and mobile
  • TLS, SRTP and ZRTP call encryption
  • Linux only
  • SIP calling needs an account with a VoIP provider
  • Proprietary, with some features in paid editions
  • Encryption depends on server support
Downloadable app Downloadable app, Browser extension
Open source Closed source
License: GPL-3.0-or-later License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.