  We describe a new interactive database (GRDB) of geometric objects in the
general area of differential geometry. Database objects include, but are not
restricted to, exact solutions of Einstein's field equations. GRDB is designed
for researchers (and teachers) in applied mathematics, physics and related
fields. The flexible search environment allows the database to be useful over a
wide spectrum of interests, for example, from practical considerations of
neutron star models in astrophysics to abstract space-time classification
schemes. The database is built using a modular and object-oriented design and
uses several Java technologies (e.g. Applets, Servlets, JDBC). These are
platform-independent and well adapted for applications developed to run over
the World Wide Web. GRDB is accompanied by a virtual calculator (GRTensorJ), a
graphical user interface to the computer algebra system GRTensorII used to
perform online coordinate, tetrad or basis calculations. The highly interactive
nature of GRDB allows for systematic internal self-checking and a minimization
of the required internal records.
