I am asked all the time about open-source programs, resources, and other free alternatives for things that can be prohibitively expensive. Don't get me wrong, sometimes there are easy answers. Big companies will offer generous discounts to educational institutions, non-profit organizations and even individual educators. However, as we also know, sometimes, there is a significant barrier when talking about access to knowledge. Let's step back for a minute and think about what is necessary versus what is desired. Of course, "free" always sounds better and seems more desirable. However, what does free really mean? After all, most of us understand that there is some inherent cost to everything. The real question is more about who is paying that cost and what are we willing to accept? Below, we will explore three primary sources of "free" resources and talk about the implications and tradeoffs involved. For our purposes, we will look at publicly available r...