Tiny Attack is a free-to-play, turn-based strategy game that can be played in any web browser, inspired by games like Advance Wars and Weewar.
We don't know any good Tiny Attack open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to Tiny Attack.