HipChat has been discontinued. Similar apps include Matrix, which is free and open source. Other options are Slack, Zulip, Mattermost and Rocket.Chat. Group Chat Apps like HipChat are a crowded field, with more than 50 alternatives for the web, Android, iPhone, Windows and Mac.
LeggoChat is a group or channel based chat platform that is designed to be easy to set up for any casual, or formal settings and discussions. Users can choose to have their messages logged and stored, or otherwise. No user accounts are required to get started at all.
This app allows to exchange secure messages and communicate instantly with users connected to the same communication server software from mobile and desktop-based messaging clients. Instant messaging is strongly encrypted and archived on the IM server which is privately hosted...
Russia
VideoMeeting is a free and open source video conference solution built to have video calls and chats using your web browser. It is a pure web application based on WebRTC that can provide communication features within your web browser.
Spain
EU
BloomText allows healthcare professionals to send messages and files securely to anyone instantly. Easily replaces the need for fax machines.
Dirc is a peer-to-peer web application which uses WebRTC to set up connections between chat participants without requiring a back-end server. The static files can be self-hosted. Other features:
Shrtct is a productivity tool for teams, providing in-context communication (chit chat free!) via Shrtct Hashes. It's great for preparing your team, making important decisions, gathering and storing information, planning, debating and hashing it out.
United States
Fast open source Slack desktop app, written in Node.js with native UI powered by the Yue library.
Disposable online chat. With anologue you can quickly and easily engage in an anonymous (or not) linear dialogue with any number of people (within reason). No accounts. No installations.
An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet stack. In addition, making a new chatroom website is a simple as downloading the files and cloning the site.
