License key management for developers of macOS applications. https://padlocksdk.com/
I've been building some macOS apps lately, and I kept duplicating and adding onto the license key backend. I figured I should build it more properly so I built a Saas for myself (and finally took the step into Laravel at the same time).
I have no costumers except myself. If anyone wants a free account in exchange for feedback I am happy to help set it up.