State-of-the-art molecular simulations pose many challenges for effective visualization and analysis due to their size, timescale, and the growing complexity of the structures under study. Fortunately, a panoply of new and emerging technologies can address these challenges. We'll describe our experiences and progress adapting VMD, a widely used molecular visualization and analysis tool, to exploit new rasterization APIs such as EGL and Vulkan, and the NVIDIA OptiX ray tracing API for interactive, in-situ, and post-hoc molecular visualization on workstations, clouds, and supercomputers, highlighting the latest results on IBM POWER hardware. Commodity VR headsets offer a tremendous opportunity to make immersive molecular visualization broadly available to molecular scientists, but they present many performance challenges for both rasterization- and ray tracing-based visualization. We'll present results from our ongoing work adapting VMD to support popular VR HMDs.