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- Socio Solutions, Chennai
- South India Positive Network, Chennai
- Southeast Economic Developers, Chennai
- Spiirt of Life Misison, Chennai
- Spine Charitable Trust, Chennai
- Spirit of Life Mission, Chennai
- Sree Siva Educational & Social Welfare Trust, Chennai
- Sri Mahalakshmi Thirunangai Welfare Association, Chennai
- Sri Poorna Mahameru Trust, Chennai
- Sri Sankara Health Centre, Chennai
- SSNM Trust, Chennai
- St. Thomas Home, Chennai
- State Resource Centre, Chennai
- Stella Rani Welfare Trust, Chennai
- Stimulus – Be The Change, Chennai
- Street Child Voice, Korukkupet
- Sukriti Social Foundation, Chennai
- Surabi – Strategic Urban Rural Advancement Backing Institute, Chennai
- Surabi Trust, Chennai
- Suyam Charitable Trust, Chennai
- Swami Vivekananda Social Service Centre, Chennai
- SWARG, Chennai
- SWARUPAM, Chennai
- SWEAT – Social Welfare Educational and Altruistic Trust, Chennai
- SWIFT – Social Welfare and Innovative Facilitation Trust, Chennai
- Synergy Foundation, Chennai
- T T Ranganathan Clinical Research Foundation, Chennai
- T.S.Arunachalam Charitable Trust, Chennai
- TAFVA – Tamil Nadu Federation of Voluntary Agencies
- Tamil Nadu Federation of Volountary Agencies, Chennai
- Tamil Nadu Handicapped Federation Charitable Trust, Chennai
- Tamil Nadu Primary School Improvement Campaign, Chennai
- Tamil Nadu Public Welfare Association, Chennai
- Tamil Nadu Social Welfare Association, Chennai
- Tamilnad Kidney Research Foundation, Chennai
- Tamilnad Network of Positive People, Chennai
- Thai Illam Social Service Trust, Chennai
- Thanthai Education Trust, Chennai
- Thathvamasi Trust, Chennai
- The Agency for Community Organization & Social Action, Chennai
- The Agency for Community Organzation & Social Action
- The Ashram – Home for Children in Crisis, Chennai
- The Banyan, Chennai
- The Candles, Chennai
- The Catalyst Trust, Channai
- The Environmental Society, Chennai
- The Friend-In-Need Society, Chennai
- The Grace Foundation, Chennai
- The Social Catalyst, Chennai
- The Spastics Society of India, Chennai
