The most popular way to play for free is TripleA , an open-source engine that perfectly replicates the board game's rules.
If you are downloading the game for the first time, you can find official PDF rulebooks for almost every version (Classic, 1942, Europe 1940, etc.) at AxisAllies.com to help you learn the mechanics. Axis & Allies Free Download
You can find the 1998 Hasbro Interactive Axis and Allies for download or browser-based play. The most popular way to play for free
Available on Steam (PC), Google Play (Android), and the Apple App Store (iPad). Google Play (Android)
Supports cross-platform play, asynchronous turns (get notified when it's your turn), and solo play vs. AI. Resources for New Players