It's common enough to see the phrases "'free' as in 'free beer'" puts it in contrast to "'free' as in 'free speech'" (which emphasises you can do what you want

It's common enough to see the phrases "'free' as in 'free beer'" puts it in contrast to "'free' as in 'free speech'" (which emphasises you can do what you want with the software). Following in popularity from these is "'free' as in 'free puppy'"; which emphasises that you'd be taking on a burden of responsibility by using it. -- At the very least, if you're using it, it may have bugs.