Chapter 1 of the "The Anti-Sanskrit Scripture" by Shyam Rao.

This work explores the history and the scale of use of Sanskrit, and concludes that Sanskrit was never spoken in India, and was restricted to the Brahmins. Author presents a tree of Indo-Iranian languages evolution, highlighting the place of Prakrits (including Pali) in Indian linguistic history.

Jain sacred books, composed in Ardha-Magadhi language, a close relative of Pali.

Introduction to the more important language families including
Indo-European, Uralic, Altaic, Afro-Asiatic, Sino-Tibetan, Malayo-Polynesian, Niger-Congo, Dravidian and others.

Comprehensive resources: historical developments, manuscripts, calligraphy, classical languages and texts.

An article by Dr Devendra Kumar Jain about the history of Inian languages, including Pali.