JSS Article: Article about the metafor package published in the Journal of Statistical Software.
Other Free/Open-Source Software
Center for Evidence-Based Medicine @ Brown: The CEBM at Brown University has supported the development of the metafor package in various ways (also by providing some financial support). In addition, the center has developed OpenMeta and OpenMEE, two open-source software packages for conducting meta-analyses that make use of the metafor package as part of the backend.
Meta-Analysis Task View @ CRAN: The meta-analysis task view on CRAN (curated and maintained by Michael Dewey) provides a nice overview of the various R packages related to meta-analysis.
Review Manager: The Review Manager (RevMan) is the software tool used for preparing and maintaining Cochrane Reviews.
MAVIS: MAVIS is a Shiny based web application for meta-analysis that makes use of metafor and a couple other meta-analysis packages under the hood.
metaforGUI: metaforGUI provides a graphical user interface (GUI) to run simple meta-analyses via metafor.
Commercial Stand-Alone Packages
Comprehensive Meta-Analysis: User-friendly commercial software package developed by Michael Borenstein (and others) for conducting meta-analyses.
MetaWin: Another commercial software package for meta-analysis (but hasn't been updated since 2007 and not sure if this package is still available).
EPPI-Reviewer: Web-bsaed software developed by the EPPI-Centre for all types of literature reviews, including systematic reviews, meta-analyses, narrative reviews, and meta-ethnographies. Makes use of metafor on the backend for the analytic functions. Free access available for Cochrane authors.
Add-Ins for Commercial Packages
David Wilson: In connection with the book Practical Meta-analysis, David Wilson has written a number of macros for conducting meta-analyses in SPSS, Stata, and SAS. The macros are available for free.
MIX: MIX 2.0 is an add-in for performing meta-analyses in Excel. An evaluation version is available for free (but only works with the built-in datasets).