Winpopup LAN Messenger is a real-time, secure and reliable instant messaging application for local area networks. It enables users to send and receive messages, files and pictures within the same LAN (Local Area Network). It offers a simple and intuitive user interface, making it easy to use by both beginners and experienced users. Winpopup LAN Messenger also provides many advanced features such as user presence, advanced message formatting, message archiving, and remote user management. It is a great solution for small, medium and large organizations that need a secure, efficient and cost-effective way to communicate with their employees.
The discontinued official website appears not to have been updated since 2008.
The last discontinued version, 2.3.3, was released on August 31, 2014. It can still be downloaded from the official website.
Discontinued Inactive since at least 2016. See https://github.com/SSilence/sum/issues/43
Discontinued It appears that the project is no longer being developed since February 2017. The latest version, 1.2.37, released in November 2016, can still be downloaded from GitHub. It is reportedly not working on Ubuntu 18.04.