The bundle comprises packages to provide: bmpsize: get bitmap
size and resolution data; centernot: a horizontally-centred
\not symbol; chemarr: extensible chemists' reaction arrows;
classlist: record information about document class(es) used;
colonequals: poor man's mathematical relation symbols;
dvipscol: dvips colour stack management; engord: define
counter-printing operations producing English ordinals;
eolgrab: collect arguments delimited by end of line; flags:
setting and clearing flags in bit fields and converting the bit
field into a decimal number; holtxdoc: extra documentation
macros; hypbmsec: bookmarks in sectioning commands; hypgotoe:
experimental package for links to embedded files; hyphsubst:
substitute hyphenation patterns; ifdraft: switch for option
draft; iflang: provides expandable checks for the current
language; pdfcolparallel: fixes colour problems in package
parallel; pdfcolparcolumns: fixes colour problems in package
parcolumns; pdfcrypt: setting PDF encryption; protecteddef:
define a command that protected against expansion;
resizegather: automatically resize overly large equations;
rotchiffre: performs simple rotation cyphers; scrindex:
redefines environment 'theindex' of package 'index', if a class
from KOMA-Script is loaded; setouterhbox: set \hbox in outer
horizontal mode; settobox: getting box sizes; stackrel:
extensions of the \stackrel command; stampinclude: selects the
files for \include by inspecting the timestamp of the .aux
file(s); tabularht: tabulars with height specification;
tabularkv: key value interface for tabular parameters;
thepdfnumber: canonical numbers for use in PDF files and
elsewhere; twoopt: commands with two optional arguments; Each
of the packages is represented by two files, a .dtx (documented
source) and a PDF file; the .ins file necessary for
installation is extracted by running the .dtx file with Plain
TeX.

Homepage:
https://ctan.org/pkg/oberdiek
