Brazil:

https://www.redemet.aer.mil.br (biggest source)
http://www.funceme.br/app/radar/animacao/quixeramobim
http://sigsc.sc.gov.br/radarsc/
http://alertario.rio.rj.gov.br/radar-meteorologico-do-sumare/imgens-recentes/
http://www.simepar.br/prognozweb/simepar/radar_msc
http://www.ipmet.unesp.br/#
https://www.climatempo.com.br/radar-sp

Except for the last one they should be all be public/free. From the government.