The Perseus Project
has a collection of online Greek (and some Latin) texts,
both original and in translation, plus reading aids like a dictionary
and a morphology
tool. Lots of other resources here, too.
The Latin Library has a good
selection of online Latin texts.
TOCSIN has
tables of contents for recent Classics journals. The online version of the
main printed bibliographical tool, L'Année
philologique, requires a subscription.
Diotima collects materials for
the study of women and gender in antiquity. Good bibliographies here plus
links to collections of images and more.