(1)
sources for diff.exe are in
patch-diff-w32-src.zip
at
http://ring.ksc.gr.jp/archives/text/TeX/ptex-win32/w32/
which I compiled by MSC.

(2)
sources for sed.exe are in
w32tex-src.tar.xz
at
https://www.tug.org/svn/texlive/trunk/Master/source/
which I compiled my MSC.

(3)
sources for iconv.exe are in
libiconv-1.16.tar.gz
at
https://ftp.gnu.org/gnu/libiconv/
which I compiled by mingw32.

(4)
sources for tar.exe are in
tar-w32.zip
at
https://www.tug.org/svn/texlive/trunk/Master/source/
which I compiled by MSC.

(5)
sources for txishell.exe, which is a renamed binary of a subset of
korn shell: sh.exe, are in
w32tex-src.tar.xz
at
https://www.tug.org/svn/texlive/trunk/Master/source/
which I compiled by MSC.

(6)
sources for gawk.exe are in
gawk-5.1.0.tar.xz
at
https://ftp.gnu.org/gnu/gawk/
which I compiled by mingw32.

(7)
other binaries are extracted from UnxUtils.zip
at
https://sourceforge.net/projects/unxutils/files/unxutils/current/
sources are found in the same site.

-- 
A. Kakuto
