KakaoTalk is described as 'Phone number based messenger service that allows users anywhere in the world to chat one-to-one or in a group for free. (no SMS service)' and is a instant messenger in the social & communications category. There are more than 50 alternatives to KakaoTalk for a variety of platforms, including Android, iPhone, Windows, Mac and iPad apps. The best KakaoTalk alternative is Signal, which is both free and Open Source. Other great apps like KakaoTalk are Telegram, Element, Tox and Wire.
Kaidan is a simple, user-friendly Jabber/XMPP client providing a modern user interface using Kirigami and QtQuick. The back-end of Kaidan is written in C++ using the QXmpp XMPP client library and Qt 5.
Germany
EU
Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
United States
One app for all your messaging.
WhatsApp, Messenger, Telegram, Skype, Zoom, Google Hangouts, Gmail, Slack, Facebook, Facebook Pages, Instagram, Twitter, Outlook, SnapMap, WeChat, LinkedIn, HipChat, and ChatWork.
GermanyEU
Open source Jabber (XMPP) client with multi-account support, clean and simple interface. Being both free (as in freedom!) and ad-free, Xabber is designed to be the best Jabber client for Android .
United States
Talkatone gives you free calls, text messages, real-time location sharing and picture sharing to Facebook and Google friends, or any phone number in US.
United States
Kopete is an instant messenger supporting AIM, ICQ, Jabber, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable for personal and enterprise use.
GermanyEU
textPlus is the best way to send unlimited text messages from your android, iPhone, iPod, kindle, and windows devices with your textPlus phone number free and calling for just pennies.
United States
Line2 is a VoIP phone service that lets you call & text from a separate phone number via WiFi or 3G/4G/LTE. At a small premium, Text & call ANYONE in the US/Canada, forwarding & more. Pick any phone number.
United States
Conduit is a simple, fast and reliable chat server powered by Matrix. Conduit is an alternative to Synapse and tries to be lightweight and easy to install, but it is still in development.
TextMe is an easy to use messaging application that allows you to send unlimited text, voice, pics, video messages to any mobile phone number in United States, Canada, Mexico, China and more than 40 countries in the World for FREE.
United States
Cloud-based call center software offering over 50 advanced features for customer experience, rapid setup, centralized management, CRM and helpdesk integrations, compatibility with any device, real-time customer info, performance metrics, and no hardware required.
SlovakiaEU
