weeki is described as 'Weeki is a free messaging app available for Android phones and other smartphones depending on the available network (3G, 4G or wifi) to allow you to send messages and call your friends and family'. There are more than 100 alternatives to weeki for a variety of platforms, including Android, iPhone, Windows, iPad and Android Tablet. The best alternative is Telegram, which is free. Other great apps like weeki are Signal (Free, Open Source), Element (Freemium, Open Source), Jitsi (Free, Open Source) and Jitsi Meet (Freemium, Open Source).
Lifesize Go gives you instant access to your own high-quality free video meeting space. Host meetings with up to eight participants from your phone or laptop without needing to download an application or install updates.
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).
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.
Cwtch (/k?t?/ - a Welsh word roughly translating to “a hug that creates a safe place”) is a decentralized, privacy-preserving, multi-party messaging protocol that can be used to build metadata resistant applications.
Group messaging platform owned by Microsoft. It's absolutely free, whether you're talking to a group of friends, or texting with one person. Best of all, it works on nearly every phone, via push or SMS. With GroupMe, it's easy to reach anyone, anytime, anywhere.
Skype Lite lets you send free text messages and make voice & video calls even under limited network conditions. Stay connected Skype Lite is optimized for 2G and unstable network connections, so you can stay connected with friends and family.