Racket (programming language)
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PLT Scheme is an umbrella name for a family of implementations of the Scheme programming language.
PLT is the group of people who produce PLT Scheme.
DrScheme is the primary PLT Scheme implementation.
TeachScheme! is a PLT project to turn Computing and Programming into an indispensable part of the liberal arts curriculum.
How to Design Programs (HtDP) is a textbook for introductory programming that was written by several PLT members.
PLaneT is PLT's centralized package distribution system. Visit for a list of user-contributed packages.
MzScheme is the lightweight, embeddable, scripting-friendly PLT Scheme implementation.