Links to Superstructure Software
AASHTO has been developing LRFD software programs for many years. Information on the design/rating software Virtis/Opis can be found on the AASHTOWARE website.
An excellent bridge website with many bridge related links including a bridge discussion forum.
Other Bridge Links
The Washington Department of Transportation (WSDOT) has developed this prestressed concrete girder program. This robust, FREE, program has a fully interactive graphical interface, and supports AASHTO LRFD specifications. This is the mainstay prestressed I-girder program for WSDOT designers. This program is definitely worth the time to check out.
The State of Pennsylvania (PennDOT) has developed a concrete prestressed girder (PSLRFD) program and a steel superstructure (STLRFD) program. Both of these inexpensive, yet comprehensive, programs support the AASHTO LRFD specifications. Note that these programs are specifically written for PennDOT needs.