Any time you want to perform offline password cracking exercises, Hashcat is going to be able to do that for you. I can't think of any scenario where you have a password hash you need to crack where another tool would be more suited to the task. Hashcat, of course, works best when you have a GPU available, but you can even use it on a VM if you use the --force flag.
It is best suited in those environments where complexity is not the key. We've used it fairly extensively in our UNIX to find weak UNIX passwords and in Windows environments too. It's very easy to get hold of as it is essentially Open Source, although a paid version is now available and we are thinking of looking at this proposition in-depth to see if it is viable. We found it easy to install and deploy across our systems. Patching was fairly regular, so we always had the latest version. It holds its own against DES and Blowfish encryption algorithms among many others.
'John the Ripper' being open source was free to use, whereas the others had to be paid for. It was very simple to install and runs against many hundreds of hashes and crypts. It is always developing thanks to large communities on GitHub.
