IBM DevOps Code ClearCase
ibm.comClearCase is a version file system masquerading as project version control. It's heavyweight, clumsy, and brittle, and it's easy to get yourself in an inconsistent state.
At one enterprise in my past it could take months to merge for release, during which time the entire repository was locked for everyone. I suspect it was the 30 years of commit history. It took years to move to something more modern.
Much better than Microsoft [Visual] SourceSafe.
I remember hearing nightmares about ClearCase from some older developers, back in the 90's. I never experienced it myself, so this was all tales of myth and legend to me.
ClearCase is the worst source control system that I've had the displeasure of using. I'm not sure what "DevOps Code ClearCase" is (latest/rebranded version of ClearCase?), but I expect that it's a raging dumpster fire of lost productivity with UX from hell.
Per a recent IBM community post:
"ClearCase is now part of DevOps Create Pillars Code subpillar."