Cambridge Relativity Group  
   Includes links to relevant conference announcements, brief descriptions of research areas, staff list and a publications index.
   http://www.damtp.cam.ac.uk/user/gr/

Max-Planck-Institut für Gravitationsphysik  
   The Albert-Einstein-Institut (AEI), in Potsdam, is an institute of the Max-Planck-Gesellschaft, and carries out research in gravitational physics.
   http://www.aei-potsdam.mpg.de/

LIGO Home Page  
   The Laser Interferometer Gravitational-Wave Observatory (LIGO) project is a pioneering effort to design and construct a novel scientific facility - a gravitational-wave observatory - that will open a new observational window on the universe.
   http://www.ligo.caltech.edu/

Queen Mary - QMW Hyperspace GR  
   A set of hypertext based services for general relativity research provided by the QMW Relativity group
   http://www.maths.qmw.ac.uk/hyperspace/

Syracuse Relativity Group  
   Includes staff information, descriptions of research being undertaken, information on colloquia and brief descriptions of relevant courses.
   http://physics.syr.edu/research/relativity/

Pennsylvania State University: Centers of Gravity  
   Includes lists of staff, publication lists, visitor information and event announcements, as well as brief descriptions of the research undertaken.
   http://gravity.phys.psu.edu/

Pittsburgh Relativity Group  
   Includes links to relevant conferences and magazine articles, a list of staff and online copies of paper preprints and theses.
   http://artemis.phyast.pitt.edu/

University of Texas at Austin - Center for Relativity  
   Includes a staff list, information on projects, seminar and publication lists, and related software information.
   http://godel.ph.utexas.edu/

Stanford U. - Gravity Probe B  
   Gravity Probe B is the relativity gyroscope experiment being developed by NASA and Stanford University to test two extraordinary, unverified predictions of Albert Einstein's general theory of relativity.
   http://einstein.stanford.edu/

Topical Interest Group on Gravitation  
   Includes a brief description of the group as well as its newsletters.
   http://gravity.phys.psu.edu/~tggweb/

U. Cape Town, South Africa  
   
   http://vishnu.mth.uct.ac.za/cosmos/

Cosmology at the University of Kentucky  
   The group is primarily interested in the numerical simulation of large-scale structure formation and the development of robust statistical measures for describing the resulting distribution
   http://www.pa.uky.edu/~splinter/cosmos.html

Italian Society on General Relativity and Gravitation -- SIGRAV  
   
   http://www.sigrav.unige.it/

London Relativity Seminars  
   Up-to-date list of talks given in the London Relativity Seminar series at the School of Mathematical Sciences of Queen Mary, University of London. (Abstracts of talks included.)
   http://www.maths.qmul.ac.uk/Astronomy/seminar/rel.html

Australasian Society for General Relativity and Gravitation  
   Includes a newsletter, information on events, and links to related research groups.
   http://www.physics.adelaide.edu.au/ASGRG/

Center of Applied Space Technology and Microgravity  
   Gravitation and relativity theory within the German Physical Society.
   http://www.zarm.uni-bremen.de/

Pennsylvania State University: Institute of Gravity  
   Includes lists of staff, publications lists, visitor information and event announcements, as well as brief descriptions of the research undertaken.
   http://gravity.psu.edu