Alternatives to CSipSimple for all platforms with any license

Signal

TextSecure and RedPhone have been merged to create Signal! Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in...

Free Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad Chrome Ubuntu Touch
Apps with End-to-End Encryption Encrypted chat Security focused Texting ... Video calling Encrypted calls Encrypted Connection Self destructing messages Video calling Voice Call Color coding Encrypted VoIP calls Forward Secrecy Group chat Integrated File Sharing Mobile friendly Night mode/Dark Theme Works Offline Protected by Password Based on phone number Privacy focused Private messaging File Sending Voice messages Add a feature

417 Like
Hangouts

Hangouts is a messaging app that lets you send and receive messages, photos and more, and even start free video and voice calls – one to one or with a group! ...
- Not a SIP client as far as I know Guest • Aug 2015
Free Windows Web Android iPhone Chrome OS ... Android Tablet iPad Chrome Android Wear
Gmail integration Group chat Multi Device Support Share your screen ... Texting Supports archiving conversations Video calling Voice Call Voice messages WebRTC Add a feature

968 Like
Jitsi

Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM...

Free Open Source Mac Windows Linux Web Android ... iPhone BSD iPad
Apps with End-to-End Encryption Group chat iPhone/iPod sync Support for Multiple protocols ... Multiple Account support OTR Video calling WebRTC Add a feature

285 Like
Jami

Voice, video and chat communications, secure, decentralized, strong privacy and freedoms.

Free Open Source Mac Windows Linux Android iPhone
Decentralized Distributed Apps with End-to-End Encryption Peer-To-Peer ... Share your screen Video calling Add a feature

105 Like
Linphone

Linphone is an internet phone or Voice Over IP phone (VoIP). With Linphone you can communicate freely with people over the internet, with voice, video, and text instant...
- Open Source SIP Voip client that is actively maintained. nrg200 • Feb 2017
Free Open Source Mac Windows Linux Web Windows Mobile ... Android iPhone Android Tablet Windows Phone iPad Xfce
Encrypted VoIP calls Video calling Add a feature

108 Like
Ekiga

Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols. It supports many...

Free Open Source Windows Linux PortableApps.com
Portable No login Video calling Add a feature

68 Like
Zoiper

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...

Free Personal $ $ $ Mac Windows Linux Web Android ... iPhone Windows Phone
Address book integration Automatic call recording Add a feature

25 Like
YakYak

What does it do: * Send/receive chat messages * Create/change conversations (rename, add people) * Leave/delete conversation * Notifications * ...

Free Open Source Mac Windows Linux Hangouts
Portable Add a feature

18 Like
Nimbuzz

Nimbuzz offers limited availablility free calls and limited availability free text messaging for users via 3G and WiFi. Calls to other Nimbuzz users are free. PAY to...

Freemium Mac Windows Web Android iPhone ... Java Mobile S60 HP webOS Blackberry Android Tablet Windows Phone iPad Chrome Kindle Fire
Voice Call Add a feature

117 Like
MicroSIP

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...

Free Open Source Windows PortableApps.com
No features added Add a feature

17 Like
SeaFour.club

SeaFour.club is a socket webchat supporting aesthetic username customization and stylized messages using a markup language similar to 'LISP', and supports a...

Free Open Source Linux Web BSD
Ad-free Group chat Lightweight Add a feature

9 Like
Sipnetic

Sipnetic is a free VoIP softphone based on the SIP protocol. Sipnetic supports voice and video calls, instant messages, presence information and end-to-end encryption.
- Nice UI, Compatible with latest Android versions, App is in active development pnozolp • Dec 2018
Freemium $ $ $ Android
Apps with End-to-End Encryption OTR Video calling Voice messages Add a feature

2 Like
Fring

Fring is a VoIP (voice over internet) app that allows you to make 2-way video calls, voice calls and live chat for free, from your phone or iPod. It offers video...
- Discontinued The apps seem to be no longer updated. Last versions, released in February 2014, can be still downloaded from the appstores.
Freemium Android iPhone
Texting Video calling Voice Call Add a feature

54 Like
Phoner Second Phone Number

Phoner provides business owner, sales people, lawyers, doctors, police officers and others with a second phone number to protect their identity and also gives the...

Free iPhone iPad
No features added Add a feature

3 Like
Sipdroid

Free and open-source SIP/VoIP Client.

Free Open Source Android
No features added Add a feature

3 Like