- SHULE COMPUTER AID
- SIHA DEVELOPMENT ORGANIZATION
- SIMBA MASAI THEATRE GROUP
- SIMBALI COMPUTER SERVICES AND GENERAL SPAIRS
- SINGIDA PEOPLE LIVING WITH HIV/AIDS (SIPHA)
- SINGIDA RURAL PEOPLE LIVING WITH HIV/AIDS(SIRUPHA)
- Small Miners Development Initiatives (SMDI)
- Small World Initiatives For Women Security and Children Orphanage (SWIWSCO
- SMS Verification
- sober tanzania