Open-source refers to software whose codes are freely available for use or duplication.
It is a code designed to be publicly accessible: anyone can access, modify and distribute the code at will.
This type of development is designed in a collaborative and decentralised way by a community and relies on the trust and validation of other users.
Open source software is often cheaper and has variable longevity, i.e. there is always a community behind the programming of the code.
Within the framework of a PIM, the Open Source mode includes several constraints to be known.