The ENVRI-KMS is a Knowledge-as-a-Service for the RI development communities to document RI services' development and operation and address engineering problems. More specifically, the knowledge management system should (1) ingest technical results from ENVRIplus, FAIR assessment, the key sub-domains, and other tasks using a formal language for knowledge representation and proven semantic technologies; (2) provide services and tools to enable RI developers and data managers to browse, search, retrieve and compare RI technical statuses and technical solutions to development problems via available content; (3) provide content management tools for specialists in the ENVRI community to ingest new knowledge and control the quality of content; (4) also provide interfaces to other existing semantic resources, e.g., the service catalog of a future ENVRI-HUB, to enhance knowledge discovery and cross-RI search, between knowledge services and the online presence of ENVRI resources.