PDkef is a one-person, open source project, so there is no support ticketing system or call center, just a real way to reach the person who builds it.
Found something broken? Report a bug. Have an idea or a question about how a tool works? Start a thread in Feedback & ideas. Both are the fastest way to get a response, and keep the conversation visible so the same answer can help the next person who runs into it.
Who you would be reaching
PDkef is built and maintained by Shlomi Shemesh. You can find more of his work, and the full commit history behind this project, on GitHub.
Because the project is open source, you are also welcome to read the code yourself before asking, or send a pull request if you have already fixed what you found. See the source repository.