imo is described as 'Imo is a free, simple,secure and faster international video call & instant messaging app' and is a very popular instant messenger in the social & communications category. There are more than 100 alternatives to imo for a variety of platforms, including Android, iPhone, Windows, Android Tablet and iPad apps. The best imo alternative is Signal, which is both free and Open Source. Other great apps like imo are Telegram, Element, Tox and SimpleX Chat.
FreeConferenceCall.com is an easy way to conduct free HD audio conference calls including audio, video and screen sharing with up to 1,000 participants at no charge.
Smoke Messenger is an open-source Instant Messenger that is known as the first mobile Messenger worlwide using the encryption algorithm McEliece. To be downloaded at F-Droid.org or Github.com. Smoke provides with its own Server-Software: SmokeStack-Echo-Server.
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.
Germany
EU
With group calls up to 256 users, Video4sure is an easy way to make video calls or setup group meetings. No need to register, install or pay. As soon as you visit the home page, it generates a unique invite link that you can share with your contacts.
Free one-click video conferencing to easily get customers face-to-face with you without a download.
United Kingdom
Hype is a chat service built into the Opera Mini browser, so you can chat, share, and browse in one app. And when you find something online worth sharing, Hype makes it easy to do so with WebSnap.
Norway
Silent Phone – Secure Encrypted Video & Voice Mobile Phone Calls
You now have the ability to have secure encrypted phone calls between Silent Circle members, anywhere, anytime, with complete control.
Make a secure call as easy as an ordinary call and be sure of real safety.
United States
KeeperChat - The leading secure messaging app.
• Private vault for messages, photos and videos • Private, encrypted media gallery (nothing is saved on device’s camera roll) • Biometric login and self-destruct protection for vault • Message retraction and self-destruct timer • Tw.
United States
HiDa! is a FREE video and audio chat app that offers complete END-TO-END security and encryption in your calls. HiDa! works in any level of internet connection and uses very less of your data. HiDa! offers a great speed and quality in the video and audio calls.
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.
Allows users to connect using either text or webcam for video conferencing. Reliable chat room open all day and night allowing people to connect online.
Zom's security and privacy features are powered by the amazing foundation created by the ChatSecure project, and works with other great apps like Conversations.
