Sakai is a free and open-source online collaboration and learning environment, which provides a set of software tools to help research institutions, commercial organizations and autonomous organizations that need to develop collaboration or learning environments to create collaborative websites. Sakai is widely used abroad, but not much at home, but companies such as Shanghai Gengshang and Beijing Asia News have carried out secondary development. I don't know which version of sakai you are using, but the configuration is slightly different. For more details, please go to Sakai Knowledge Station.