Surely many times you have searched for alternatives for instant messaging in a local network, it can be for use in the office or at home. Without a doubt, the most important thing is that it is free, does not require installation and configuration, allows files to be transferred and is in Spanish.
In most cases I recommend the OpenFire server, but it requires some knowledge to configure the server and install the Spark, Pidgin or any other client of your preference on the users' computers. Sometimes I recommend Pop Messenger, very good too, but it's not free.
So I decided to use LAN Messenger again, which apart from being free, has a portable version (no installation required), only downloads, executes and ready, you can communicate and share files with your colleagues.