- SHIRIKA LA WANAWAKE KATIKA ELIMU (SWE)
- shirika la watu waishio kwa uhakika tunduma
- SHIRIKISHO LA VYAMA VYA WATU WENYE ULEMAVU MWANZA
- SIMBA MASAI THEATRE GROUP
- SINGIDA PEOPLE LIVING WITH HIV/AIDS (SIPHA)
- SINGIDA RURAL PEOPLE LIVING WITH HIV/AIDS(SIRUPHA)
- Small Miners Development Initiatives (SMDI)
- SMS Verification
- sober tanzania
- Social and Economic Development Foundation (SEDEF)