For openage alternatives, define whether you want an engine for development or a playable strategy-game experience. Those are different comparisons.
- Check required source assets and supported platforms.
- Run a representative skirmish and observe controls, AI, pathfinding, and performance.
- If modding matters, change a unit or map and rebuild the project.
- Test multiplayer, saves, and version compatibility with the intended group.
- Compare development documentation and maintenance activity.
A similar-looking RTS may not support the same assets or workflows. Decide from a complete play or modding test, not screenshots.
Akousa