Where can I download the client code from?

Here is GKB-Editor, the graphical OKBC Editor implemented in Lisp.
Here is the OKBC implementation in Java
Here is Jot the OKBC Editor implemented in Java
Here is the OKBC implementation in Common Lisp
Here is the OKBC client implementation in C
Here is the OKBC KSL connection implementation for Lisp

All the previous files are the latest implementations. But you may also want to pick a specifically dated version. More generally, all OKBC implementations and documents can be found here

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