LAN Messenger

LAN Messenger is a p2p chat application for intranet communication and does not require a server. A variety of handy features are supported including notifications...

• Discontinued The project seems to be no longer developed since February 2017. Last version, 1.2.37, released in November 2016, can be still downloaded from GitHub. It is reportedly not working on Ubuntu 18.04

Free Open Source Mac Windows Linux PortableApps.com

Feem

"Hi. My Name is Feem. I happen to be the best local file transfer app on Earth." Feem works like Bluetooth; but 50X faster. Feem sends files instantly from...

Freemium Mac Windows Linux Android iPhone ... Android Tablet Windows Phone iPad

Simple Chat

Simple Chat is a simple, opensource and powerful cross-platform client-server chat for local networks and the Internet. Features Open-source software Simple...

• Discontinued Last version, 2.3.3, was released on 31 August 2014. It can be still downloaded from the official website.

Free Open Source Mac Windows Linux

jMessenger

An open-source java based chat and file-transfer application

Free Mac Windows Linux

Vypress Chat

Vypress Chat is a user-friendly application for real-time chatting in small office or home office (SOHO) local networks. This unique chat software features an...

Commercial Windows Linux

qchat

QChat is a simple crossplatform LAN chat. It is written using Qt4 so you can compile it on any platform supported by Qt.

• Discontinued official web site appears to have not been updated since 2008.

Free Open Source Mac Windows Linux

Winpopup LAN Messenger

Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.

Free Personal Windows

BORGChat

BORGChat is a LAN messaging software program. It has achieved a relative state of popularity and it is considered to be a complete LAN chat program.

Free Windows

Bopup IM Suite

Organize secure messaging system and communicate instantly via self-hosted IM server.

Commercial $ $ $ Windows Android

IBM Sametime

IBM Sametime instant messaging products integrate real-time social communications into your business environment, providing a unified user experience through instant...

Commercial Mac Windows Linux Android iPhone ... Android Tablet iPad

SUM - Secure Ultimate Messenger

SUM is a simple secure desktop instant messenger for local networks. No server infrastructure is needed. All communication is encrypted and nothing saved on any server.

• Discontinued Inactive since at least 2016. See https://github.com/SSilence/sum/issues/43

Free Open Source Windows

Network Assistant

Network Assistant is a multiple-mode user-friendly network communication utility, including real-time chat, shared whiteboard, message board and instant messaging. It is...

Commercial Windows

Output Messenger

Private and Secure Instant Messenger for Office designed specifically for keeping remote employees and multiple offices in sync. "Give your team the freedom to...

Commercial Mac Windows Linux Android iPhone ... Self-Hosted

BigAnt Office LAN Messenger

BigAnt Office LAN Messenger offers rich features for secure and stable business communication. Including instant messaging, group discussion, remote desktop sharing...

Commercial Windows

Softros LAN messenger

Local instant messaging application for an office chat, messages broadcast and files transfer. .

Commercial Mac Windows Android Android Tablet