Open Source Windows Chat Software

ConneX is a pure p2p collaboration platform based on JXTA technologie. its provides Real-Time collaboration tools in form of Plug-ins (instant messaging, file sharing, chat, whiteboard, slide show)100% Java.

SyncShare Server is a secure messaging and real-time collaboration platform. Build solutions to connect people, data, and applications through firewalls and mobile devices. It handles all networking, security issues and lets one focus on the business

A secure collaborative framework that is being used by other projects such as CFAgent (online customer service), CFWeb (pure HTTP communication for CFAgent) and much more in addition to serving as a standalone all-in-one collaboration platform by itself.

Convey is a real-time, online, multi-user collaboration tool which augments text, graphics, and symbols. Examples of graphics include shapes, mathematical expressions, diagrams, flow charts, and pictures.

ExtremeTalk(XT)是一个用于企业或者组织内部进行在线通讯的，基于XMPP(Jabber)协议的即时通讯系统。ExtremeTalk(XT) is an Instant Messaging(IM) collaboration platform based on XMPP(Jabber) for enterprises and organizations

Messy is a collaboration tool for distributed teams. It provides for instant messaging between members of the collaborating groups, a basic group management framework over which additional capabilities can be layered, and a sample concurrent editor.

OpComm - The Operational Communicator - a IM/collaboration software which should help developers do realtime design and development collaboration even being in distant places of the world, or game players to communicate efficiently during a network game.

QuickChatter is a local lan collaboration tool written in Qt. The goal of the project is to provide a local LAN tool for chatting, exchanging files, sharing workspace and more.

Spicebird is an open-source email and collaboration suite based on the Mozilla platform. It provides integrated e-mail, contacts, calendaring and instant messaging. It can connect to any SMTP/IMAP email server, CalDav Calendar server and Jabber serve

Simple and secure collaboration platform that improves your team productivity. Fully compliant with GDPR. Twake is powered by Linagora, trusted by more than 3000 organizations around the world to improve their organizational productivity. Communicate seamlessly with your team using channels. Invite external users, start a video meeting, share files, and collaborate on documents. Manage your project timelines, create new tasks, move tasks based on their progress, and assign duties and deadlines to your team members. Easily access all your shared and stored documents using Twake's drag-and-drop file manager. Manage versions and labels, and edit your files with ease. Create team events, attach video conference links, relevant files and tasks, configure notifications for various members, and set deadlines for tasks.