There are a number of data profiling and discovery tools that are available for free download. Needless to say, a number of these are open source products but there are also, notably, proprietary vendors that make their products available as free to use offerings, albeit sometimes with restrictions on who can use them and how. In addition, of course, there are also suppliers that make their products available on a try-before-you-buy basis. In other words, you can use the product for free for a limited period of time.
Such offers are commonplace across the software industry but they are especially apposite within the context of data profiling and discovery. It is worth considering why that is before we compare the various free-to-use products that are available.