SimBricks is an open-source, modular simulation framework enabling full end-to-end evaluation of modern heterogeneous systems by combining battle-tested simulators for different system components like machines (e.g. QEMU, gem5, Simics), hardware components (e.g. Verilator, Tofino, FEMU SSD), and networks (e.g. ns-3, OMNeT++). SimBricks is fast, scalable, accurate and deterministically connects and synchronizes simulators while being able to run unmodified full system stacks, including applicatio