Zenodo is a general-purpose open-access repository developed under the European OpenAIRE program and operated by CERN where publishers and developers to archive data sets, research software, reports, and any other research related digital artifacts
OpenAIRE is a European project supporting Open Science, harvesting research output from connected data providers. OpenAIRE aims to establish an open and sustainable scholarly communication infrastructure responsible for the overall management, analysis, manipulation, provision, monitoring and cross-linking of all research outcomes. It serves as an international indexing platform.
The Google index is similar to an index in a library, which lists information about all the books the library has available.