There may be packages with old websites not redirecting to the new ones hosted on GitHub pages, and links from package authors' pages to those old websites. Some of them are listed here. It would be good to systematically check all packages and remind to package authors.
There may be packages with old websites not redirecting to the new ones hosted on GitHub pages, and links from package authors' pages to those old websites. Some of them are listed here. It would be good to systematically check all packages and remind to package authors.
LieAlgDB at http://old.sztaki.hu/~schneider/Research/LieAlgDB/ (author requested in GAP Support on 2019-04-15)
link to LieAlgDB from http://www.science.unitn.it/~degraaf/
other packages at http://www.science.unitn.it/~degraaf/ waiting for their new releases made from GitHub (except CoReLG, which is now at https://github.com/gap-packages/corelg but did not have a release from GitHub yet).
https://homepages.warwick.ac.uk/~mareg/ has two links to GAP at http://www-gap.dcs.st-and.ac.uk/~gap/ no longer accessible (reported to Derek Holt)
http://www.maths.nuigalway.ie/~rossmann/fwtree/ provides fwtree 1.0, while version 1.1 is available at https://gap-packages.github.io/fwtree/ and is redistributed with GAP (author requested on 2019-03-05).
tomlib (reported at Set up redirect for the old website tomlib#19)
https://csserver.evansville.edu/~mroeder/HAPcryst.html to https://gap-packages.github.io/hapcryst/ (asked in Make new release from GitHub hapcryst#1)
http://www.maths.nuigalway.ie/~dane/nilmat/ to https://gap-packages.github.io/nilmat/ (Dane Flannery asked by email on 2020-02-10).