Zoiper is described as 'IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure' and is an app in the social & communications category. There are more than 25 alternatives to Zoiper for a variety of platforms, including Android, Windows, iPhone, Mac and iPad apps. The best Zoiper alternative is Jami, which is both free and Open Source. Other great apps like Zoiper are Jitsi Desktop, Wire, Zulip and Linphone.
Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement
Some users think Jami is a great Zoiper alternative, some don't.
Jami is the most popular Windows, Android, Mac & iPhone alternative to Zoiper.
Jami is the most popular Open Source & free alternative to Zoiper.
Jitsi Desktop (previously SIP Communicator) is a legacy audio/video and chat communicator with full encryption, precedessor of Jitsi Meet .
No Windows version as said
Most users think Jitsi Desktop is a great Zoiper alternative.
Jitsi Desktop is the most popular Web-based & Self-Hosted alternative to Zoiper.
Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.
no SIP with is the base for VOIP
Zoiper allows you to call a regular phone number using a standard VoIP service (SIP or IAX) - the other person doesn't have to use Zoiper.
Main funcionality from Zoiper: SIP. It's not supported by Wire
This alternative is disputed. Wire is a legitimate Zoiper alternative, but it might have issues that some users think are important.
Wire is the most popular SaaS alternative to Zoiper.
Zulip is the only modern team chat app that is designed for both live and asynchronous conversations. Zulip topics create a separate space for each discussion, so different conversations will never get in each other's way.
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Linphone is quite half-baked if you do not use their full system.
Most users think Linphone is a great Zoiper alternative.
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Video conversations with up to 8 people in your browser - no downloads, no login. Just name your channel and you are on. Works in all modern browsers, even mobile.
MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack. It allowing to do high quality VoIP calls (P2P or on regular telephones) via open SIP protocol. From cloud of SIP providers you can choose best for you, register account and use it with MicroSIP. You'.
Small and works. Call record option to mp3/ wav. Only one sip line can be active when multi are configured.
Open source, light, simple and powerfull.
Stable and free alternative to the non comercial version of Zoiper
The 3CX Phone System is the software-based private branch exchange (PBX) Phone system based on the SIP (Session Initiation Protocol) standard and enables extensions to make calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services...
PhonerLite enables your PC to use it for internet telephony (VoIP , Voice over IP, SIP). You need an internet connection and an account from a provider supporting the SIP protocol.
On-Meet is a free video conferencing platform that allows you to share your knowledge with your friends, colleagues and family.
Canada
United States
Switzerland
France
EU
Norway
Cyprus
Sound quality, open source, multiplatform, multi channels, and a long list of features