Mesa is an open-source Python library for agent-based modeling, ideal for simulating complex systems and exploring emergent behaviors.
Brian is a free, open source simulator for spiking neural networks.
Comprehensive optical design, optimization, and analysis in Python, including GPU-accelerated and differentiable ray tracing via PyTorch.
FreeFEM source code
Agent-based modeling framework in Julia
Trixi.jl: Adaptive high-order numerical simulations of conservation laws in Julia
A Python native dynamical system simulation framework in the block diagram paradigm.
A graph-native simulation engine for building composable engineering simulations and digital twins.