Open Source C# Messaging Platforms

See https://pidgin.im/about/ for more information. Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr. It is written in C and makes heavy use of GLib and GTK+. Finch is a command line instant messaging program. It also lets you log in to accounts on multiple chat network simultaneously, and it is compatible with the same chat networks as Pidgin. It is written in C and makes heavy use of GLib and ncurses.

DiscordChatExporter is a cross-platform utility that allows users to export Discord chat histories into structured files for archival, analysis, or backup purposes. The tool connects to Discord accounts and retrieves message history from servers, channels, or direct messages, then converts the data into formats such as HTML or JSON. It is designed to preserve message structure, timestamps, attachments, and formatting so exported conversations remain easy to navigate and review. The project is widely used for moderation audits, research, community archiving, and personal record keeping. With both command-line and GUI usage patterns available through the ecosystem, it supports automation as well as manual workflows. Overall, DiscordChatExporter provides a reliable way to extract and preserve Discord communications outside the platform.

RevokeMsgPatcher is a reverse engineering patch tool for Chinese messaging apps QQ and TIM. It prevents message recall (revocation) by modifying the app’s behavior to retain recalled messages, allowing users to see messages that would otherwise be deleted. Primarily used in Windows environments, the tool is popular among users who prefer transparency in their chats.

Windows 11/10 taskbar area application that allows toggle of any desktop window "Always On Top" state. For example keep Messenger always on top of other windows or any other application that you'd like to always have visible.

#aim (pronounced "shame") is a multi-protocol instant messaging client written in C#

A simple an easy to use Instant Messenger application to use on networked computers. Minimal to no setup required.

Azonto is a Cross-Platform Mobile Messaging Application that allows users to share images, songs, videos, create and add each other to groups. It is for the trendy who wants to be on top of the mobile messaging game.

CodeIM is an open source instant messenger for developers to support code exchange.

Galaxium is an multi-session, multi-protocol instant messenger application build for GNOME users. It uses the GTK# and GDI+ libraries as well as the Mono Framework.

It's just another Instant Messenger based on jabber

An instant messenger network (including client and server) using Web services technology for communication. Makes use of external Web services for automatic translation of text messages between different languages. Client written in Java, server in C#.

IP Messenger: 1. communication between People who works on computer. 2. communicate one to one. 3. u can send text or other files by this tool. 4. based on .Net PlatForm with WPF UIElement.

ISIM messenger is everything you need to stay in touch with friends from Skype, Facebook, Google+ (Jabber) and ICQ. ISIM doesn't contains any advertisements or so much functions. What ISIM gives to you? - chatting with anyone from protocols above in nice chat window with colorfull nicks and smileys - cotnact list with avatars, availability icons, unreaded messages indicator - calling, conference, video calls (just a test at the moment) and sending files though Skype

InkDrop is a lightweight Jabber instant messenger with a clean user interface.

IIM is an Instant Messaging Solution for corporate environments where IM programs like AIM and MSN have been banned. It is not firewall aware and only works within a switched network so it is not vulnerable to external attack. Uses .Net Framework 1.1

LANCast IM will be a local area network(LAN) instant messaging software inspired by the AChat protocol. The project only at a planning stage, but things should move and coding should start this autumn

A small (ish) messaging server for small businesses and other things like LAN parties or whatever you want to use it for. It has two components, the client and server. The clients can connect to servers and use that as a hub to communicate between each other. The admin running the server can also kick and ban people if they wish to. It also has peer to peer file transfer that currently has no size limit. Can't really explain all the features here, I'm running out of characters. Go look down below for all of the features or download it to see them for yourself!

MirandaIM is a new free Instant Messenger and offers hundreds of functions. The only problem is:MirandaIM is hard to configuarte. That's why we have founded the MirandaX-Project,in which we create different completely pre-configured Miranda-IM Version

Mossawir Network Messenger is a simple, easy to use LAN messaging and chat application that allows messages to be sent between users on a network peer-to-peer with no need for a server.

OfficeSIP Softphone and Messenger are two enterprise VoIP SIP clients written in C# in .NET Framework. The SIP clients make use of Microsoft UCC API SDK, ensuring the highest quality of audio and video. Compatible with Office Communications Server. See also open source, cross-platform: 1) simple messenger Brief Msg at http://briefmsg.org 2) MUVConf is a multi-user video conferencing, see demo video http://youtu.be/YrBU-Aqtvrk, download https://code.google.com/p/muvconf/downloads/list

This software project hopes to develop a instant messenger (IM) based on the Microsoft .NET Framework using C#. It will include a plugin system that allows for multiple types of IM protocols. This also includes a purpose to have a clean and functional UI

Res01 Messenger - Messenger - Chatroom

Spider IM is (will be) a GTK+ based Jabber/XMPP client written in C# (Mono).

Instant Messenger with unicast and multicast integrated

ZIM is a highly extensible C# instant messaging platform aimed at the small business looking to enhance communication amongst co-workers to increase productivity.