Yvon Henel
The contributor Yvon Henel appears to be present as the CTAN community member Le TeXnicien de surface.
Automatically typeset the academic year (French way)
Key/value support with a hash
Declare active character substitution, robustly
Helps to type the pronunciation of English words
Enumerate with lower- or uppercase Greek letters
Using expl3 to implement some numerical algorithms
French translation of l2tabu
Write numbers in lower case roman numerals
Prevent page numbers on part pages
Define simple macros for greek letters
Define matrices by given list of values
Macros for French teachers of mathematics
Extra mathematical characters in Adobe Type 1 format
A symbol loader