- SOCIAL AND ECONOMIC DEVELOPMENT INITIATIVES OF TANZANIA
- Social Mainstreaming for Gender Equality Organization
- SOCIAL MOMENTUM ORGANIZATION
- Social Vision Group Tanzania (SOVIGOTA)
- Society Empowerment Agency
- Society for Service to Rural Development in Tanzania
- Society for Women and AIDS in Africa
- SOCIO-ECONOMIC DEVELOPMENT TRUST FUND
- Songambele Initiative Organisation
- Songea Women and children care organization