说服一家大公司使用免费软件？

I'm currently a developer at my first job right out of college. I work for a large company, and the trend I notice with them is that they tend to go with more expensive, closed source software about 99% of the time, while there are perfectly good open source alternatives that are available, most of which are vastly superior to their closed-source counterparts. For example, we use this absolutely awful source control software that cost a ton of money, while there are quite a few open source and/or free options that in my experience, albiet limited, are much better and offer basically the exact same functionality. I'm currently a developer at my first job right