Our library has been working with OSS for a number of years and weâre slowly expanding what we do with OSS. Iâm here to share our experiences and tell you a bit about OSS. Open Source Software is interesting in that it can be a free lunch. It's free and can save your library money. Yet, choose carefully because even free software costs time and effort. As such bad software can be like having a crazy kitten in your house. What is Open Source? Why is it important? How to judge OSS. Overview of the market. How we use OSS at MJCPL.