HPC-Europa3 offers scholarships for visits for scientific collaboration, and includes access to participating supercomputers, including Snellius.
PRACE (Partnership for Advanced Computing Europe) is a collaboration between several European HPC Centers, to create a truly European HPC infrastructure. It offers several access programs to European Tier-0 and Tier-1 systems. Check the following programmes for accessing Snellius through PRACE:
DECI (Distributed European Computing Initiative) for transnational access to Tier-1 systems.
SHAPE (SME HPC Adoption Programme in Europe) for European businesses to adopt high-performance computing.