Can you at least list some good or better hash tables?
For better ones I would point to my linked list implementation: https://github.com/rurban/ctl/blob/master/ctl/unordered_set.... (because it has various security policies, nobody else has) or https://github.com/LIMachi/swiss-table (all in C)
The CTL "unordered set" is roughly the same bad design as its namesake in C++, presumably on purpose. We really shouldn't be teaching new users this bad structure, nor the "security policy" mitigations it provides. And by the way it's not a "distributed" denial of service when somebody plugs 128 colliding values into your API, just a normal trivial DOS.