Our two most important websites are:
General with descriptions, taxonomic histories, guests,... : http://www.formicidae.be/
Distributions of our ants: http://www.formicidae-atlas.be/
They are both about Belgian ants, not only about Flanders like the titles say.
While our sites only mentiones established ants (native and pests) the Dutch site (The Netherlands) also mentiones all finds (and also includes most of our ants): http://www.nlmieren.nl/