This is a collection of different packages that provide key=value functionality in plainTeX, LaTeX, and ConTeXt.

At the core, the expkv package implements two expandable key=value parsers that are somewhat fast and robust against common bugs in many key=value implementations (no accidental brace stripping, no fragility for active commas or equals signs).

expkv-cs enables users to define expandable key=value macros in a comfortable and straightforward way.

expkv-def provides an interface to define common key types for expkv similar to the key defining interfaces of widespread key=value implementations.

expkv-opt allows parsing package or class options in LaTeX via expkv.

expkv-pop is a utility package to define prefix oriented parsers that allow a somewhat natural formulation.