An interactive, WebGPU-accelerated simulation of Large-Scale Structure (LSS) evolution. The software utilizes a "2.5D" Universe approach, projecting a thin slice of a 3D universe onto a 2D plane, to visualize the formation of cosmic filaments and voids from z = 10 to the present via a live web interface. It combines analytical 2LPT with a local quasi-N-body gravity scheme, incorporating rigorous background expansion and structure growth for LCDM and w0-wa dark energy models. To maintain smooth interactivity with up to 200k tracers, particle interactions are computed locally and include a phenomenological adhesion model. The tool features two distinct modes: a cosmological sandbox with realistic initial conditions and an "enhanced BAO" mode designed to highlight the emergence of Baryon Acoustic Oscillation signals. Optimized for high-performance browser rendering (WebGL/WebGPU), it is designed for professional scientific presentations, classroom teaching, and public outreach.

Written for the Wide-Field Infrared Survey Telescope (WFIRST) high-latitude survey, the exposure time calculator (ETC) works in both imaging and spectroscopic modes. In addition to the standard ETC functions (e.g. background and S/N determination), the calculator integrates over the galaxy population and forecasts the density and redshift distribution of galaxy shapes usable for weak lensing (in imaging mode) and the detected emission lines (in spectroscopic mode). The program may be useful outside of WFIRST but no warranties are made regarding its suitability for general purposes.