Browse the Indo-European language classification system. Includes modern and extinct languages.
Paper is a detailed explanation of the state of reconstruction of PIE, with a section on similarities between PIE and Afro-Asiatic languages.
Article contains a brief but comprehensive overview of the evolution of Indo-European languages.
Find the words for the numbers 1 through 10 in many Indo-European languages, charted for comparison.
Guide to the evolution of English provides this tree of Indo-European languages, grouped by kinship.
Linguist provides this guide to the Indo-European family and its ancient parent language, Proto-Indo-European.
Essay provides an introduction to the posited ancestor of the Indo-European languages.
Find a linguistic map and discussion of the evolution of Romance languages. Text is provided in English and Catalan.