LAN Messenger Portable 1.2.35 is a peer-to-peer chat application that lets you chat and transfer files with other users on your local network. It's packaged in PortableApps.com Format so it can easily integrate with the PortableApps.com Platform. And it's open source and completely free.

LAN Messenger is a free and open source cross-platform instant messaging application for communication over a local network. It does not require a server. A number of useful features including event notifications, file transfer and message logging are provided.

Key features
* Instant messaging
* Connect and chat with users on your network.
* Secure messaging for privacy
* All messages are protected by AES encryption with RSA as the key exchange mechanism.
* Broadcast messages
* Send notifications to all users or specified users.
* File transfer
* Exchange files with others easily.
* Organize contacts
* Arrange your contacts into groups for easier management.
* Message logging
* Past conversations are logged and can be retreived at any time.
* Serverless architecture
* A server does not need to be set up on the network for LAN Messenger to work.
* No internet connection required
* As the name suggests, LAN Messenger works inside the local network and does not require internet access. This helps to minimize external threats.
* Multilanguage user interface
* You can select the language for the user interface.
* Cross-platform support
* All the features of this application are supported on Windows, Mac and Linux. The interface is fully integrated with the native environment of each platform.

LAN Messenger Portable is packaged in a PortableApps.com Installer so it will automatically detect an existing PortableApps.com installation when your drive is plugged in. It supports upgrades by installing right over an existing copy, preserving all settings. And it's in PortableApps.com Format, so it automatically works with the PortableApps.com Platform including the Menu and Backup Utility.