Open Source C# Chat Software

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.

HunterPie is a modern overlay application for Monster Hunter games that gives players real-time information during hunts. It was rewritten from scratch for its v2 generation while keeping the same focus on a clean, powerful, and easy-to-use experience. The overlay can show hunting data through modules, plugins, widgets, and customizable interface elements. It is useful for players who want clearer visibility into damage, monster data, party performance, and other hunt-related context. The project is built as a desktop application and requires the .NET Desktop Runtime. HunterPie is best understood as an extensible companion tool for Monster Hunter players who want more feedback and personalization than the base game interface provides.

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.

Tipic Inc. is proud to announce the born of the first Open Source, P2P, VoIP and Video conferencing solution for XMPP/Jabber. The target of this project is to develop a new portable set of codes using high quality libraries to add VoIP and Video to XMPP

Icq# is a .NET implementation of the OSCAR/ICQ protocol specifications.

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 is a online chat program that requires no email address, no registration and no personal information. You can chat with all users that is using this program, if you have their username. How to use: Enter an username into the first textbox and then click connect. Then type is the username of the person you want to send a message, type in the message and click send. ----------------------------------------------------------------- This program is a BJCustomSoft product and is written in CSharp. Credits to Andriy Mykhaylyu who is the developer on ImapX llibrary.

Yammy (Yahoo Messenger Archive Decoder) allows you to decode and view not only yours but, also other stored YM conversations. You don't even need a password!

AIML Verbot Converter - Converts AIML files to Verbot KnowledgeBase (VKB) files. Visit http://www.verbots.com/ and http://www.alicebot.org to learn more about AIML and Verbots. Implemented in C# (.NET).

YTalk Cursor Freedom (YCF) is a small C# app that you can run inside of YTalk which provides an extended feature set for YTalk such as the ability to use the arrow keys.

This is an IRC dice bot. This bot supports crypto-seeded random rolls of multi-sided dice. This bot logs onto an IRC server and awaits input by players. DiceBot includes support for roll multipliers (5d20) and roll modifiers (1d20 + 1d1547 - 5 * 2 / 4).

Simple IRC client for Pocket PC and Smart Phone devices (powered by Windows CE). User Interface application and reusable IRC client library.

This is a funcional application for Windows for your Telegram Bot. To create your own bot you must register new bot by BotFather bot in Telegram. BotFather will give you unique Autch code that will be used in this application.

This is Ultimate SMS clients that allow you to send text message to all mobile number in India. Using popular sms service providers like Way2sms, Fullonsms, 160by2, Ultoo.com... Etc. Using this you can send sms ads free 100%

A. R. Live Support is online chat software, developed in Asp.net(2.0) and XML. Easy to use and it facilitates 1-o-1 live communication between customers and executives. Flexible live chat software that provides the customer support with a click.

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!

SecureTEL is a peer-to-peer internet phone/chat/file sharing program working over a secure AES-encrypted connection and using a pair of X509 certificates for authentication

nebohodimo IM is a Jabber client for Windows Mobile devices. It's written to be stable over unreliable mobile connection and easy to use.

utilities and libraries for gamedev - pure c# rar unarchiver, mp3 decoder. c++ flac module repacker. other misc. things.

NOTE! xg moved to github, no mor updates are published to sourceforge! see you @ http://github.com/lformella/xdcc-grabscher

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

.IRC (or dotIRC) is an IRC client written in C#. Its goal is to provide an easy to use IRC client that will be eventually be compatible with Microsoft's System.Windows.Forms library under .NET and GTK# under Mono. It is using the SmartIrc4net library.

This is a set of .NET class libraries, designed to use various Internet protocols in a easy-to-use OO matter. So far it contains a POP3 and an IRC (Internet Relay Chat) library.

.nIRC is an IRC client written in C#. It has full support for text formatting, file sending, etc, and allows the use of IronPython scripts in order to make further customisation easier.