https://ctan.org/recommendations/leiletter
CTAN: Suggestions for LEIletter
ctansuggestions
https://ctan.org/ctan-ann/id/mailman.4408.1581350994.2586.ctan-ann@ctan.org?lang=de
CTAN: CTAN-ann - New on CTAN: LEIletter
ctanannnew
https://ctan.org/pkg/leiletter
CTAN: Package LEIletter
ctanpackage