Sorin Olteanu's Linguae Thraco-Daco-Moesianae (LTDM) Project

This incomplete site is devoted to information on ancient Indo-European languages spoken in the Balkans: Thracian, Dacian and Moesian. It also contains a corpus of Greek and Latin sources, as well as information on ancient Balkans geography, and possible
http://soltdm.tripod.com/

Computers and Linguistics: The Indo-European Family Tree

Article by R.L.Fowler on the use of computers for the study of the branching of the Indo-European family.
http://www.arts.uwaterloo.ca/CLASS/computer.htm

Indo-European Home Page

Links to various projects involving the Indo-European language, maintained by Dr. Deborah W. Anderson, Dept. of Linguistics, UC Berkeley.
http://www.indo-european.org/

Numerals in Indo-European Dialects

Comparative presentation of the numerals 1-10 in the Indo-European languages, including reconstructions in Proto-Indo-European and various intermediate proto (reconstructed) languages.
http://members.tripod.com/~rjschellen/IENums.htm

Indo-European Studies

Collection of links to sites and books dealing with Indo-European studies.
http://www.centrostudilaruna.it/indoeuropei.html

Knowing Words in Indo-European

Exploration of the etymology of words related to the word "know" in the Indo-European languages.
http://www.friesian.com/cognates.htm

IE Documentation Centre

Website devoted to Indo-European linguistics and culture, from the University of Texas at Austin.
http://www.utexas.edu/cola/depts/lrc/iedocctr/ie.html

The Indo-European Mailing List

Web-searchable archives of a mailing list devoted to the discussion of Indo-European linguistics and archaeology.
http://listserv.linguistlist.org/archives/indo-european.html

TITUS - Thesaurus Indogermanischer Text- und Sprachmaterialien

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, incl. English-language materia
http://titus.uni-frankfurt.de/indexe.htm

WordGumbo: Comparative Indo-European

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.
http://www.wordgumbo.com/ie/cmp/

Comparative Indoeuropean Data Corpus

Lexicostatistical data on 95 Indo-European languages and/or dialects collected by Professor Isidore Dyen of Yale University before 1970.
http://www.ntu.edu.au/education/langs/ielex/HEADPAGE.html

The Paleolithic Continuity Theory on Indo-European Origins

A major site presenting a very unorthodox view of Indo-European origins. Many scholarly papers; many links.
http://www.continuitas.com/index.html