scrwfile
KOMA-Script spin-off that routes write operations through the .aux file so LaTeX almost never runs out of write registers.
Package scrwfile is a KOMA-Script spin-off and was part of that collection
up to scrwfile version 0.1.12 resp. KOMA-Script version 3.38. It has been
removed from KOMA-Script because it is experimental and no longer maintained
officially.
scrwfile is a LaTeX package, that provides a means of sending all
LaTeX \newrite, table of contents, and other miscellaneous output via
the LaTeX .aux-file. The mechanism subverts the mechanism of
\newrite, and means there will almost never be a “No room for new \write”
message.
The package is hosted on GitHub. Further information can be found in the CTAN catalog entry.