WWF
The World Wildlife Fund website for tigers contains a solid overview of the issue, including different species of tigers, as well as useful information on the importance of tigers, threats to their survival, actions from the organisation and even provides information on what you can do to help resolve the issue.
wct
The website for Wildlife Conservation Trust contains an extensive list of operations undertaken by the organisation over the past years, including research, wildlife protection, education and health.
Chinese government action plan
An extremely detailed action plan for preserving the South China Tiger. It contains extensive information on the issue overall, as well as current projects, future goals, difficulties and problems, organisational structure and budgets.
PROJECT TIGER
The Project Tiger website contains an immense amount of information detailing the Indian government's response to the declining population of tigers, including background, milestone initiatives, actions and reports.