As far as I understand, Kent's Implementation Patterns are more low level than design patterns.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
GoF = Gang of Four.Named after 4 engineers from IBM who provided solution for a particular type of problem(s). The design patterns like Singleton,Factory,Template,Command etc all fall under GOF patterns.
To know exactly the patterns you can read the book HeadFirst Design Patterns.