Repository for review protocols and systematic reviews in any area related to food, food production, food safety, animal health, and animal welfare. SYREAF also provides information about carrying out systematic reviews.
International Initiative for Impact Evaluations is for policymakers and researchers who are looking for evidence on what works, what doesn’t, and why in development. Their evidence hub includes a systematic review repository.
The Evidence for Policy and Practice Information and Co-ordinating Centre (EPPI-Centre) conducts systematic reviews in the fields of Education, Health Promotion and Public Health, as well as social welfare and international development.
The Collaboration for Environmental Evidence (CEE) is an open community of scientists and managers working towards a sustainable global environment and the conservation of biodiversity. They provide evidence syntheses concerning environmental policy and practice.
You can search any scholarly database that published research in your field of interest through Cornell University Library. Include "systematic review" as a search term to find systematic reviews in your discipline.