TABASCAL (TrAjectory BAsed RFI Subtraction and CALibration) models and subtracts radio-frequency interference (RFI) in post-correlation radio-interferometry data by jointly fitting trajectories of RFI sources and antenna gain solutions. It builds a source-to-visibility forward model that incorporates near-field moving RFI (such as satellites or aircraft) and uses JAX (ascl:2111.002) and Dask to scale across CPUs and GPUs for calibration and subtraction tasks. The toolkit accepts visibility data, metadata on RFI trajectories or two-line elements, and YAML-based simulation configuration files to generate cleaned visibilities and produce diagnostics of gain and RFI fit quality. TABASCAL enables calibration workflows that recover astronomical signals with reduced data loss by explicitly modeling RFI trajectories rather than simply flagging contaminated data.

The N-body code gevolution complies with general relativity principles at every step; it calculates all six metric degrees of freedom in Poisson gauge. N-body particles are evolved by solving the geodesic equation written in terms of a canonical momentum to remain valid for relativistic particles. gevolution can be extended to include different kinds of dark energy or modified gravity models, going beyond the usually adopted quasi-static approximation. A weak field expansion is the central element of gevolution; this permits the code to treat settings in which no strong gravitational fields appear, including arbitrary scenarios with relativistic sources as long as gravitational fields are not very strong. The framework is well suited for cosmology, but may also be useful for astrophysical applications with moderate gravitational fields where a Newtonian treatment is insufficient.