Comparative presentation of the numerals 1-10 in the Indo-European languages, including reconstructions in Proto-Indo-European and various intermediate proto (reconstructed) languages.
This incomplete site is devoted to information on ancient Indo-European languages spoken in the Balkans: Thracian, Dacian and Moesian. It also includes a corpus of Greek and Latin sources, as well as information on ancient Balkans geography, and possible substratum influences on Albanian, Romanian, and Bulgarian, and etymological information on Romanian.
Collection of scholarly material devoted to Indo-European linguistics, from the Institute of Comparative Linguistics of the Johann Wolfgang Goethe-Universität, Frankfurt am Main, and related institutions [Multilingual site, includes English-language material]
An interesting hodge-podge of pages on various branches and individual member languages of the Indo-European family. There are vocabularies of "lesser-known" languages, and links to major on-line dictionaries of better-known ones.