Here's some from a quick google search:
Not to discourage any further answers but you'll probably find these older posts useful:
Why is Hindu and Greek mythology so similar? and How much evidence do we have for the existence of a Proto Indo-European language and what is its significance in world history? by /u/-more_fool_me-
Where do the Hindu gods Vishnu and Shiva fit into Indo-European mythological history? by /u/lcnielsen