Another similar use case that is quite common is that your tool can use one of several different calculation kernels. For example there is one option that is f

Another similar use case that is quite common is that your tool can use one of several different calculation kernels. For example there is one option that is fast but closed source, one that is open source but slower and one option that only works with Nvidia GPUs. Most people won't have all three options available, but as long as you have one of them the software works fine.