Zulip is described as 'Threaded group chat with topics for live or async collaboration, open-source, supporting self-hosted or cloud use, suited for organized team discussions' and is a very popular instant messenger in the social & communications category. There are more than 100 alternatives to Zulip for a variety of platforms, including Android, iPhone, Web-based, Windows and iPad apps. The best Zulip alternative is Signal, which is both free and Open Source. Other great apps like Zulip are Telegram, Element, Discord and Matrix.
Coco Voice is a Walkie Talkie app to share voice, text, and pictures.
xat is a fun social networking site with the coolest online chat box. Make friends, join a group or run your own chat. Over 2500 unique smilies to combine and use. Embed to your blog or page for free (no need to download). Also available on mobile.
RelayBeam is a messaging platform with an innovative multi-port feature for enhanced communication.
WhatsGreen Multi Messenger is the easiest way to chat with friends from Chrome Browser without a phone. With WhatsGreen Multi Messenger you will never miss a message again while working on your PC.
AVAILO is a business communication app for teams. One place for internal and external communications, open groups for your team members, service providers and customers, with real time messaging, share emails, folders and files, in a simple way.
Virtual PBX enables small businesses to set up professional, hardware-free phone solutions with Auto Attendant, business SMS, call routing, enhanced voicemail, customizable greetings, faxes, scalable extensions, and an online portal for easy management.
Pinger lets you text and talk free with the people you care about most, anywhere on the planet. Tap a picture and you'll see all of your communications—texts, pics, calls, voicemails—all in one place.
Mileo is instant group messaging app that connects teacher-student, coach-player and leader-follower over single unique code instead of phone numbers.
Numbertank is a place to express yourself, discover yourself, and bond over the stuff you love. Whether it’s fandoms or philosophy, fashion or felines, Numbertank is where your interests connect you with your people.
Textie Messaging is the unlimited text and photo messaging app for Android and iOS. If you and a friend are still paying to text each other, try using Textie Messaging instead—and communicate for free.
Talk2Me allows Push To Talk or Walke-Talkie like functionality for Windows Phone 7 Users.
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