Free Open Source Software is software that you can truly feel belongs to you. It is usually developed by community-driven projects of which the whole aim is to provide people with high-quality software that equals or betters the capabilities of proprietary, closed source software that you have to pay for and that limits your rights and ownership.
LibreOffice is a perfect example of this development model. If this inspires your enthusiasm, then you might consider how you might get involved. For more reading about the principles of Open Source, try reading this article: