X-Lite is not available for Linux but there are some alternatives that runs on Linux with similar functionality. The best Linux alternative is Jami, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to X-Lite and ten of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to X-Lite are Jitsi Desktop, Linphone, Psi XMPP Client and Zoiper.
Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement
Jitsi Desktop (previously SIP Communicator) is a legacy audio/video and chat communicator with full encryption, precedessor of Jitsi Meet .
Free, open-source, plenty of features such as MS Outlook integration, ability to connect to external directories such as LDAP and MS Active Directory ...
can connect to arbitraty VOIP providers
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.
Does not allow connecting to sip server
Feature-rich XMPP client for advanced users offering strong customization options, secure encrypted messaging (TLS, OpenPGP, OTR, OMEMO), file transfers, audio/video calls, support for animated emoticons, modern themes, group messaging, and multi-platform compatibility.
Zoiper 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.
All the same features, same look and feel changing skin. The only cons: Can't make conference or transfer unless you pay. Can't set up auto answer as well (available in licenced version)
It shows options to change the call configuration after the set up unlike others where we cannot change the account configurations.
Zoiper requires one of their selected providers, you can't add a local PABX.
Does not include SIP client softphone functionality.
QuteCom is a community of enthusiasts and developers, creating free software products related to communication over IP. The flagship product of the QuteCom project is a softphone which allows you to make free PC to PC video and voice calls, and to integrate all your IM contacts...
Free live webcam video chat room software for multiple desktop platforms including mobile platforms like iOS and Android.
Spreed is the worldwide unified web conferencing service offering integrated web and telephone conferencing. It is based on Flash Player. Free service includes 3 attendees and max 1.5h meetings. Single events or monthly service can be purchased.
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Does not allow connecting to sip server