Conference Management Systems
This is rather a departure for prof.so but I hope it will prove useful. The following is a list of conference management systems appropriate for running scientific conferences and in particular to support the associated review process.
I have made a personal judgment on the extent to which systems are 'current' and I have excluded some small projects where the feature set was unclear or where there is no provision for review.
Each system is based around a somewhat different model of the review process, generally reflecting different scientific 'cultures'. It is wise to be aware of this. Features change from version to version and it is always advisable to check if there are any critical features you require. There are no systems that combine strong support for both the review process and event management.
Please add any comments below if there are systems I have missed or experience with the use of these systems you would like to share.
conf2py Conference Management System http://code.google.com/p/conf2py/
Open Source
Conference Management Toolkit (CMT) http://cmt.research.microsoft.com/cmt/
Free service
Confious http://www.confious.com/
Commercial service
ConfISS http://www.confiss.org/index.php?page=home
Open Source with commercial service option
ConfTool http://www.conftool.net/
Limited license, free for small academic events
Continue Conference Management http://continue.cs.brown.edu/
Free service with commercial support
Cyberchair http://www.borbala.com/cyberchair/
Open Source with commercial service option (used and recommended by @profserious)
Easychair http://www.easychair.org/
Free service with commercial support
EDAS Conference Services https://edas.info/doc/
Commercial service
Ex Ordo http://exordo.com/
Commercial service
HotCRP Conference Management Software http://www.read.seas.harvard.edu/~kohler/hotcrp/
Open Source
iChair http://lasecwww.epfl.ch/iChair/
Open Source
OpenConf http://www.openconf.com/
Free Community and Paid Professional Editions (hosted or licensed)
Open Conference Systems http://pkp.sfu.ca/?q=ocs
Open Source, service options available
Oxford Abstracts http://www.oxfordabstracts.com/
Commercial service
Precision Conference Solutions http://precisionconference.com/
Commercial service
Wonference http://wonference.com
Commercial service
Zookeepr Conference Management System http://zookeepr.org/
Open Source