Online databases are crucial infrastructures to facilitate the wide effective and efficient use of mouse mutant resources in life sciences. The number and types of mouseresources have been rapidly growing due to the development of genetic modification technology with associated information of genomic sequence and phenotypes. Therefore, data integration technologies to improve the findability, accessibility, interoperability, and reusability of mousestrain data becomes essential for mousestrain repositories. In 2020, the RIKEN BioResource Research Center released an integrated database of bioresources including, experimental mousestrains, Arabidopsis thaliana as a laboratoryplant, cell lines, microorganisms, and genetic materials using Resource Description Framework-related technologies. The integrated database shows multiple advanced features for the dissemination of bioresource information. The current version of our online catalog of mousestrains which functions as a part of the integrated database of bioresources is available from search bars on the page of the Center (https//brc.riken.jp) and the Experimental Animal Division (https//mus.brc.riken.jp/) websites. The BioResource Research Center also released a genomic variation database of mousestrains established in Japan and Western Europe, MoG+ (https//molossinus.brc.riken.jp/mogplus/), and a database for phenotype-phenotypeassociations across the mouse phenome using data from the International Mouse Phenotyping Platform. In this review, we describe features of current version of databases related to mousestrainresources in RIKEN BioResource Research Center and discuss future views.