I could add some indeed, but it would maybe be better to select only the two best ones?
Which ones should replace the two on the site which you say they don't work?

A few Brazilian plate checks (we don't have to add them all but I am region blocked from placafipe and the other two on our site don't seem to work for me either).

https://buscaplacas.com.br/
https://www.olhonocarro.com.br/
https://brabocar.com.br/
https://www.consultaauto.com.br/ - click blue box "consulta pelta placa"

Thanks, updated

I think BAR has moved to the new site: https://www.bar.ca.gov/inspection

Thanks, added

For Western Australia (Vehicle Licence Expiry Date Enquiry)
Just enter the plate number

https://online.transport.wa.gov.au/webExternal/registration/

The link for Vietnam does not work any more:
http://www.vr.org.vn/ptpublic_web/ThongTinPTPublic.aspx
Do someone has a new one to suggest?

Thanks, I added it

antp check history now works for French plate.

https://immatriculation-auto.info/en

I updated the link. Right now it does not seem to work though...