Casa das Ciências is an online portal in Portugal that provides open educational resources for science teachers. The portal aims to collect and share materials developed by teachers and researchers to support science education in primary and secondary schools. All registered users can access, use, and discuss the shared materials. They can also upload their own developed classroom resources to share with other teachers. The portal is supported by the Calouste Gulbenkian foundation and measures the impact of shared materials based on frequency of use and user comments, similar to citations in academic research. The goal is for the portal to become a national reference for science education resources in Portugal.