Welcome to PuDe (Puffy Denies [Them]) project.
PuDe is a very simple daemon which guards access to SSH server. It is meant to be used in OpenBSD.
The idea is very simple. PuDe check every attempt to log in. If log in failed PuDe calculates how many attempts form that IP already failed. If number of failed attempts excess defined threshold PuDe denies that IP any access.
Please keep in mind that PuDe is very experimental, alpha state, software. ABSOLUTELY NO WARRANTY! It is like a toy make for fun.
Please, read the license.
If you are looking for stable software for guarding your computer you may be interested in ssh guard project.