Joseph Wright <[log in to unmask]> writes:

> Handy list. I'll have to look through by hand as what I need to know is
> direct use of expl3 material (as I know about fontspec, simply requiring
> it is not so much of the issue as subsequently \ExplSyntaxOn within the
> package).

The subset with at least one occurence of \ExplSyntaxOn is not so big:

./texmf-dist/tex/latex/chextras/chextras.sty
./texmf-dist/tex/latex/expl3/l3names.sty
./texmf-dist/tex/latex/expl3/l3precom.sty
./texmf-dist/tex/latex/fontspec/fontspec-patches.sty
./texmf-dist/tex/latex/fontspec/fontspec.sty
./texmf-dist/tex/latex/mh/breqn.sty
./texmf-dist/tex/latex/realscripts/realscripts.sty
./texmf-dist/tex/latex/unicode-math/unicode-math.sty
./texmf-dist/tex/latex/xltxtra/xltxtra.sty
./texmf-dist/tex/latex/xpackages/xbase/ldcsetup.sty
./texmf-dist/tex/xelatex/polyglossia/polyglossia.sty
./texmf-dist/tex/xelatex/xepersian/xepersian-mathsdigitspec.sty

-- 
Rasmus Villemoes
<http://rasmusvillemoes.dk/>