Populous Downloads

This website is entirely devoted to downloads for Populous, catering for versions 1, 2, 3 and the unofficial version 4.
http://www.strategyplanet.com/populous/bart5986/populous_downloads/

FreePop

An open source project which is reimplementing the classic game as represented in Populous 1 and 2. The site features downloads, project news and an invitation for programmers to assist.
http://freepop.sourceforge.net