Twin directories of plain:

[DIR]  ftp://ftp.gfz-potsdam.de/pub/home/sf/indridi/forjurgen/texmf/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/obsolete/macros/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/language/vietnamese/vntex/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/generic/encxvlna/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/plain/plnfss/doc/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/plain/plnfss/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/xetex/generic/zhspacing/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/xetex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/macros/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/install/macros/xetex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/install/macros/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/language/armenian/armtex/examples/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/language/armenian/armtex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/language/devanagari/velthuis/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/language/lithuanian/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/fonts/iwona/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/fonts/kurier/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/pgf/base/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/pgf/contrib/pgfplots/doc/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/graphics/pgf/contrib/pgfplots/tex/plain/
[DIR]  ftp://ftp.inf.utfsm.cl/pub/tex-archive/fonts/antt/tex/plain/
[DIR]  ftp://ftp.tex.ac.uk/tex-archive/macros/xetex/generic/zhspacing/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/plain/plnfss/doc/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/plain/plnfss/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/xetex/generic/zhspacing/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/xetex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/obsolete/macros/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/install/macros/xetex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/install/macros/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/language/armenian/armtex/examples/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/language/armenian/armtex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/language/devanagari/velthuis/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/language/vietnamese/vntex/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/language/lithuanian/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/macros/generic/encxvlna/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/fonts/iwona/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/fonts/kurier/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/graphics/pgf/base/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/graphics/pgf/contrib/pgfplots/doc/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/graphics/pgf/contrib/pgfplots/tex/plain/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gnu-crypto/gnu-crypto/manual/api/gnu/crypto/sasl/plain/
[DIR]  ftp://ftp.kreonet.re.kr/gnu/ibiblio/www/savannah-checkouts/gnu/gnu-crypto/manual/api/gnu/crypto/sasl/plain/
[DIR]  ftp://ftp.kreonet.re.kr/CTAN/fonts/antt/tex/plain/
[DIR]  ftp://ftp.uni-stuttgart.de/pub/systems/acorn/riscos/ftp.acorn.co.uk/documents/products/RiscPC/technotes/plain/
[DIR]  ftp://ftp.mcs.vuw.ac.nz/_mnt/pub/packages/tex/macros/plain/
[DIR]  ftp://ftp.uni-koeln.de/tex/macros/plain/
[DIR]  ftp://ftp.uni-koeln.de/tex/language/armtex/v2.0/examples/plain/
[DIR]  ftp://ftp.uni-koeln.de/tex/language/armtex/v2.0/plain/
[DIR]  ftp://ftp.uni-koeln.de/tex/language/vietnamese/vntex/tex/plain/