Paul Ebermann
Extensions of the \listfiles concept.
Expandable \@testopt (and related) macros.
Extensible arrows in mathematics.
Typeset quotient structures with LaTeX.
Some enhancements to the gmdoc package.
Minipages with marginal notes.
Improved underlines in mathematics.
German LaTeX package documentation.
Marginal pictures.
Declare robust command, with \newcommand checks.