The ones I’ve seen in the wild are pvcs and ccc/harvest, but there are others. I think they usually try to brand it as part of a larger end-to-end SDLC tool or change management, or it’s built to work with a specific proprietary system like Autodesk vault.
Ethically you can make as many digital or physical personal copies as you want for yourself outside of perhaps a concern for wasting resources but if you sell them you’re taking away earnings from an author or rights holder or owner which may each have different moral weight and require recognition of property rights as a thing worth having. But if you’re caught with hundreds or thousands of copies or copies where they are easily accessible to the public it’s going to appear pretty suspicious.