If you're looking for a Metaculus alternative, AIcrowd could be worth a look. AIcrowd is a collaborative platform that connects data science experts and enthusiasts to solve real-world problems through a variety of challenges. The site focuses on AI in different areas, promoting open innovation and community engagement. You can participate in discussions, find collaborators and see winning solutions, which means problem solvers can band together and learn from each other, much like on Metaculus.
Another option worth considering is CulturePulse. The site offers insights that can inform high-level decisions with AI-powered digital twins. It offers features like risk assessments and strategic communication evaluations in simulated environments. Although it's geared more toward global news feeds and policy effects, it offers similar predictive and analytical abilities, so it's worth a look for those interested in strategic forecasting and analysis.