$ luarocks install jknappenMiscellaneous macros by Jörg Knappen, including:
represent counters in greek;
Maxwell's non-commutative division;
latin1jk, latin2jk and latin3jk, which are their inputenc definition files that allow verbatim input in the respective ISO Latin codes;
blackboard bold fonts in maths;
use of RSFS fonts in maths;
extra alignments for \parboxes;
swap Roman and Sans fonts;
transliterate semitic languages;
patches to make (La)TeX formulae embeddable in SGML;
use maths "minus" in text as appropriate;
simple Young tableaux.