Data from public institutions and research institutions
ISTAT
European Institute for Gender Equality, Femicide: a classification system, Luxembourg: Publications Office of the European Union, 2021
France
Spain
United Kingdom
The bilingual site (English/French) Canadian Femicide Observatory for Justice and Accountability also gives interesting analysis on policies.
A very interesting site is the bilingual (English/Hebrew) Israeli Observatory on Femicide, with data, debates, several analytical contributions and news.