GrabCAD. It's free, simple cloud-based version control for CAD files. I don't think they actually offer an enterprise (on-prem) version anymore but I would still consider it enterprise software.
The only alternatives are network shares filled with v1_v2_final_edited filenames and very expensive, SAP-level of complexity and JIRA-style approval workflows.
Unfortunately they are owned by Stratasys, the Oracle of 3D printing and the product is barely maintained. When it was acquired they made it free. It was meant to become the github (in terms of de facto standard for public repositories) of 3D CAD, and be an inroad to 3D printer / 3D printing service sales. But that aspect never took off, Stratasys is bleeding marketshare and an at any time I expect to login and see that the service is discontinued.
Getting off-topic but I'm interested to see if there are any replies:
For all software engineers reading this, I can't state how behind other engineering disciplines are compared to software. The equivalent to git or SVN or even CVS never appeared as standard practice and there is barely any middle ground between no version control whatsoever and formal change control boards (which is no version control whatsoever except at a few milestones and if you're lucky you can verify a change to the milestone by checking a paper or dvd).
Outside of software, academic spin-offs tend to start with good practices, such as markdown or latex files for documentation, which work well with version control, but never seem to make it more than 5 years before they reach a state of no control / word documents.
Electrical CAD is becoming better, with more software-background hobbyist and more open source tools arriving. It helps that design files and manufacturing files started to converge in the 80s due to early automation and thus tend to be text-based and diffable. Mechanical CAD on the other hand tends to be somewhat incompatible between vendors and binary in nature. The open source alternatives (FreeCAD and OpenSCAD) are a decade away from providing 1990s features and hobbyists have free licenses to proprietary software (eg Fusion 360) so there is very little pressure to make a good tools in the open source world.