National Center for Ecological Analysis and Synthesis (NCEAS)
German Centre for Integrative Biodiversity Research (iDiv)
BEACON Center for the Study of Evolution in Action
Center for Open Science (COS)

Canadian Institute for Ecology and Evolution (CIEE)
Canadian Centre for Evidence-Based Conservation (CCEC)
Living Data Project

Berkeley Initiative for Global Change Biology (BiGCB)
Socio-Environmental Synthesis Center (SESYNC)
Environmental Data Initiative (EDI)

African Institute for Mathematical Sciences (AIMS)
Global Young Academy (GYA)

Society for Open, Transparent Ecology and Evolutionary Biology (SORTEE)
Canadian Reproducibility Network (CRN)
Association for Interdisciplinary Meta-Research and Open Science (AIMOS)

SRSM.org  - Society for Research Synthesis Methodology webpage
Systematic Review Tools - a database of tools for systematic reviews and meta-analysis
Cochrane Collaboration - systematic reviews for medical sciences
Campbell Collaboration - systematic reviews for social sciences
CAMARADES Collaboration - systematic reviews for medical experiments on animals
Collaboration for Environmental Evidence - systematic reviews for environmental sciences
Conservation Evidence - evidence-based conservation
PRISMA - transparent Reporting of Systematic Reviews and Meta-Analyses
Meta-analyses in Ecology and Evolution - a blog by Bob O'Hara (Nov 3, 2011)
Practical Meta-Analysis Effect Size Calculator - an online tool by Campbell Collaboration
Meta-analysis unit - University of Murcia
Meta-analysis packages in R - a blog by Pairach Piboonrungroi
Meta-analysis resources - Resources and networking for those who conduct or interpret meta-analyses related to any phenomenon that is gauged in multiple studies