LicenseCrawler is not available for Mac but there are a few alternatives that runs on macOS with similar functionality. The best Mac alternative is AppShelf. It's not free, so if you're looking for a free alternative, you could try Mac Product Key Finder. If that doesn't work for you, our users have ranked four alternatives to LicenseCrawler, but unfortunately only two of them are available for Mac. If you can't find an alternative you can try to filter for web or SaaS options.
AppShelf... Have you purchased applications in the last several months or even years ago and now have no idea where the serial number is? Do you find yourself digging through archived emails in search of registration info?
Mac Product Key Finder is a simple tool for recovering lost product keys for mac applications. Currently, list of supported software consists of only programs, icluding Microsoft Office 2008, Adobe Photoshop CS3-CS5, Parallel's Desktop, Panic applications, etc)