Fifteen codes were added to the ASCL in October 2020:

Astronomaly: Flexible framework for anomaly detection in astronomy
Exo-DMC: Exoplanet Detection Map Calculator
grapus: GRavitational instability PopUlation Synthesis
GSpec: Gamma-ray Burst Monitor analyzer
LaSSI: Large-Scale Structure Information

Legolas: Large Eigensystem Generator for One-dimensional pLASmas
lenspyx: Curved-sky python lensed CMB maps simulation package
MBF: MOLSCAT 2020, BOUND, and FIELD for atomic and molecular collisions
Pix2Prof: Deep learning for textraction of useful sequential information from galaxy imagery
plancklens: Planck 2018 lensing pipeline

relxill: Reflection models of black hole accretion disks
ROGER: Automatic classification of galaxies using phase-space information
stella: Stellar flares identifier
stsynphot: synphot for HST and JWST
TACHE: TensoriAl Classification of Hydrodynamic Elements

Twenty-five codes were added to the ASCL in September 2020:

AstroVaDEr: Unsupervised clustering and synthetic image generation
Binary-Speckle: Binary or triple star parameters
CASI-3D: Convolutional Approach to Structure Identification-3D
Chrono: Multi-physics simulation engine
cosmoFns: Functions for observational cosmology

CosmoloPy: Cosmology package for Python
CRAC: Cosmology R Analysis Code
DASTCOM5: JPL small-body data browser
FLEET: Finding Luminous and Exotic Extragalactic Transients
halomod: Flexible interface for the halo model of dark matter halos

Harmonia: Hybrid-basis inference for large-scale galaxy clustering
ISPy3: Integrated-light Spectroscopy for Python3
J plots: Tool for characterizing 2D and 3D structures in the interstellar medium
JetSeT: Numerical modeling and SED fitting tool for relativistic jets
MADHAT: Gamma-ray emission analyzer

minot: Modeling framework for diffuse components in galaxy clusters
MLG: Microlensing with Gaia
MSL: Mining for Substructure Lenses
oxkat: Semi-automated imaging of MeerKAT observations
Paramo: PArticle and RAdiation MOnitor

pySpectrum: Power spectrum and bispectrum calculator
PyWST: WST and RWST for astrophysics
rcosmo: Cosmic Microwave Background data analysis
SPInS: Stellar Parameters INferred Systematically
vlt-sphere: Automatic VLT/SPHERE data reduction and analysis

Twenty-seven codes were added to the ASCL in August 2020:

Barry: Modular BAO fitting code
CMEchaser: Coronal Mass Ejection line-of-sight occultation detector
CVXOPT: Convex Optimization
DUCC: Distinctly Useful Code Collection

Eclaire: CUDA-based Library for Astronomical Image REduction
healpy: Python wrapper for HEALPix
HorizonGRound: Relativistic effects in ultra-large-scale clustering
iFIT: 1D surface photometry code

kinesis: Kinematic modeling of clusters
KLLR: Kernel Localized Linear Regression
Magnetizer: Computing magnetic fields of evolving galaxies
maxsmooth: Derivative constrained function fitting

MUSIC2-monofonIC: 3LPT initial condition generator
ParaMonte: Plain powerful parallel Monte Carlo library
PhaseTracer: Cosmological phases mapping
PySAP: Python Sparse data Analysis Package

ramses2hsim: RAMSES output to 3D data cube for HSIM
SEDBYS: Spectral Energy Distribution Builder for Young Stars
SOT: Spin-Orbit Tomography
sslf: A simple spectral-line finder

SuperNNova: Photometric classification
SuperRAENN: Supernova photometric classification pipeline
TDEmass: Tidal Disruption Event interpretor
TRISTAN: TRIdimensional STANford code

Ujti: Geodesics in general relativity
Umbrella: Asteroid detection, validation, and identification
zeus: Lightning Fast MCMC

Twenty-four codes were added to the ASCL in July 2020:

CaTffs: Calcium triplet indexes
CosmoGRaPH: Cosmological General Relativity and (Perfect fluid | Particle) Hydrodynamics
DarkHistory: Modified cosmic ionization and thermal histories calculator
FleCSPH: Parallel and distributed SPH implementation based on the FleCSI
GProtation: Measuring stellar rotation periods with Gaussian processes

hierArc: Hierarchical analysis of strong gravitational lenses
JB2008: Empirical Thermospheric Density Model
Line-Stacker: Spectral lines stacking
MAGI: Initial-condition generator for galactic N-body simulations
MPSolve: Multiprecision Polynomial SOLVEr

OSPEX: Object Spectral Executive
PARS: Paint the Atmospheres of Rotating Stars
PeTar: ParticlE Tree & particle-particle & Algorithmic Regularization code for simulating massive star clusters
polyMV: Multipolar coefficients converter
PoPE: Population Profile Estimator

PSRVoid: Statistical suite for folded pulsar data
pygwinc: Gravitational Wave Interferometer Noise Calculator
ReadPDS: Visualization tools for PDS4 data
SPARTA: SPectroscopic vARiabiliTy Analysis
SPARTA: Subhalo and PARticle Trajectory Analysis

spex_to_xspec: Convert SPEX output to XSPEC input
SPEX: Spectral Executive
TROVE: Theoretical ROVibrational Energies
wdtools: Spectroscopic analysis of white dwarfs

Twenty-three codes were added to the ASCL in June 2020:

2D-FFTLog: Generalized FFTLog algorithm for non-Gaussian covariance matrices
ARCHI: Add-on pipeline module for background star analysis from CHEOPS data
AstroCatR: Time series reconstruction of large-scale astronomical catalogs
AxionNS: Ray-tracing in neutron stars

CARACal: Containerized Automated Radio Astronomy Calibration pipeline
CosmoCov: Configuration space covariances for projected galaxy 2-point statistics
CosmoLike: Cosmological Likelihood analyses
deepSIP: deep learning of Supernova Ia Parameters

DeepSphere: Graph-based spherical convolutional neural network for cosmology
FAMED: Extraction and mode identification of oscillation frequencies for solar-like pulsators
GenetIC: Initial conditions generator for cosmological simulations
HEARSAY: Simulations for the probability of alien contact

JoXSZ: Joint X-ray and SZ fitting for galaxy clusters in Python
KinMS: Three-dimensional kinematic modelling of arbitrary gas distributions
MCSED: Spectral energy distribution fitting package for galactic systems
Powderday: Dust radiative transfer package

PRIISM: Python module for Radio Interferometry Imaging with Sparse Modeling
PRISim: Precision Radio Interferometer Simulator
pxf_kin_err: Radial velocity and velocity dispersion uncertainties estimator
PyPopStar: Single-age, single-metallicity populations generator

SERVAL: SpEctrum Radial Velocity AnaLyser
TATOO : Tidal-chronology Age TOOl
TATTER: Two-sAmple TesT EstimatoR

Sixteen codes were added to the ASCL in April 2020:

ArviZ: Exploratory analysis of Bayesian models
ASTRAEUS: Semi-analytical semi-numerical galaxy evolution and reionization code
Finesse: Frequency domain INterfErometer Simulation SoftwarE
FUNDPAR: Deriving FUNDamental PARameters from equivalent widths

IllinoisGRMHD: GRMHD code for dynamical spacetimes
IRDAP: SPHERE-IRDIS polarimetric data reduction pipeline
kombine: Kernel-density-based parallel ensemble sampler
Locus: Optimized differential photometry

PPMAP: Column density mapping with extra dimensions
PRECISION: Astronomical infrared observations data reduction
PyCosmo: Multi-purpose cosmology calculation tool
PyKat: Python interface and tools for Finesse

PyWD2015: Wilson-Devinney code GUI
stardate: Measure precise stellar ages
Tangra: Software for video photometry and astrometry
WD: Wilson-Devinney binary star modeling

And twenty codes were added in May 2020:

2DBAT: 2D Bayesian Automated Tilted-ring fitter
AMPEL: Alert Management, Photometry, and Evaluation of Light curves
Carpyncho: VVV Catalog browser toolkit
cdetools: Tools for Conditional Density Estimates

FETCH: Fast Extragalactic Transient Candidate Hunter
FFANCY: Fast Folding Algorithm for pulsar searching
gotetra: Cosmic velocity fields tracking through the use of tetrahedra
HiFLEx: Echelle data reduction pipeline

HIPSTER: HIgh-k Power Spectrum EstimatoR
MCRaT: Monte Carlo Radiation Transfer
michi2: SED and SLED fitting tool
NNKCDE: Nearest Neighbor Kernel Conditional Density Estimation

qubefit: MCMC kinematic modeling
RAPP: Robust Automated Photometry Pipeline
REDFIT: Red-noise spectra directly from unevenly spaced time series
RFCDE: Random Forests for Conditional Density Estimation

RID: Relativistic Image Doubling in water Cherenkov detectors
RM-Tools: Rotation measure (RM) synthesis and Stokes QU-fitting
RoLo: Calculate radius and potential of the Roche Lobe
s3PCF: Compute the 3-point correlation function in the squeezed limit

Fourteen codes were added to the ASCL in March 2020; I’d hoped to process more entries, but well, you know… circumstances. I hope to do better in April.

acorns: Agglomerative Clustering for ORganising Nested Structures
AstroHOG: Analysis correlations using the Histograms of Oriented Gradients
CoastGuard: Automated timing data reduction pipeline
HOMER: MCMC-based inverse modeling code
MAGNETAR: Histogram of relative orientation calculator for MHD observations

MARGE: Machine learning Algorithm for Radiative transfer of Generated Exoplanets
PORTAL: POlarized Radiative Transfer Adapted to Lines
PYSOLATOR: Remove the orbital modulation from a binary pulsar and/or its companion
RAPID: Real-time Automated Photometric IDentification
RHT: Rolling Hough Transform

scousepy: Semi-automated multi-COmponent Universal Spectral-line fitting Engine
TESS-Point: High precision TESS pointing tool
TOASTER: Times-Of-Arrival Tracker
Torch: Coupled gas and N-body dynamics simulator

Stay safe, stay home, stay well.

Twenty-two codes were added to the ASCL in February 2020:

Apercal: Pipeline for the Westerbork Synthesis Radio Telescope Apertif upgrade
Bayesfit: Command-line program for combining Tempo2 and MultiNest components
Cobra: Bayesian pulsar searching
CR-SISTEM: Symplectic integrator for lunar core-mantle and orbital dynamics
DASH: Deep Automated Supernova and Host classifier

DISKMODs: Accretion Disk Radial Structure Models
DMRadon: Radon Transform calculation tools
ExoCAM: Exoplanet Community Atmospheric Model
ExoRT: Two-stream radiative transfer code
ExoSim: Simulator for predicting signal and noise in transit spectroscopy observations

GizmoAnalysis: Read and analyze Gizmo simulations
GWecc: Calculator for pulsar timing array signals due to eccentric supermassive binaries
HaloAnalysis: Read and analyze halo catalogs and merger trees
libstempo: Python wrapper for Tempo2
ODUSSEAS: Observing Dwarfs Using Stellar Spectroscopic Energy-Absorption Shapes

ORIGIN: detectiOn and extRactIon of Galaxy emIssion liNes
ProSpect: Spectral generation package
PyHammer: Python spectral typing suite
RASCAS: Resonant line transfer in AMR simulations
ScamPy: Sub-halo Clustering and Abundance Matching Python interface

SDAR: Slow-Down Algorithmic Regularization code for solving few-body problems
triceratops: Candidate exoplanet rating tool

Fifteen codes were added to the ASCL in January 2020:

BTS: Behind The Spectrum
CosMOPED: Compressed Planck likelihood
DebrisDiskFM: Debris Disk Forward Modeling
ExoTETHyS: Exoplanetary transits and eclipsing binaries modeler
FAKEOBS: Model visibilities generator

FragMent: Fragmentation techniques for studying filaments
gnm: The MCMC Jagger
MCMCI: Markov Chain Monte Carlo + Isochrones method for characterizing exoplanetary systems
Min-CaLM: Mineral compositional analysis on debris disk spectra
ORCS: Analysis engine for SITELLE spectral cubes

Peasoup: C++/CUDA GPU pulsar searching library
Protostellar Evolution: Stellar evolution simulator
RPPPS: Re-analyzing Pipeline for Parkes Pulsar Survey
sf3dmodels: Star-forming regions 3D modelling package
TRANSPHERE: 1-D spherical continuum radiative transfer

Twenty codes were added to the ASCL in December 2019:

anesthetic: Nested sampling visualization
ASKAPsoft: ASKAP science data processor software
AstroAccelerate: Accelerated software package for processing time-domain radio astronomy data
Athena++: Radiation GR magnetohydrodynamics code
casacore: Suite of C++ libraries for radio astronomy data processing

DALiuGE: Data Activated Liu Graph Engine
Enterprise: Enhanced Numerical Toolbox Enabling a Robust PulsaR Inference SuitE
FORSTAND: Flexible ORbit Superposition Toolbox for ANalyzing Dynamical models
GAME: GAlaxy Machine learning for Emission lines
GriSPy: Fixed-radius nearest neighbors grid search in Python

GWpy: Python package for studying data from gravitational-wave detectors
HARMPI: 3D massively parallel general relativictic MHD code
HSIM: HARMONI simulation pipeline
MRExo: Non-parametric mass-radius relationship for exoplanets
Polyspectrum: Computing polyspectra using an FFT estimator

PopSyCLE: Population Synthesis for Compact object Lensing Events
PTMCMCSampler: Parallel tempering MCMC sampler package written in Python
QSOSIM: Simulated Quasar Spectrum Generator
STACKER: Stack sources in interferometric data
Tangos: Framework and web interface for database-driven analysis of numerical structure formation simulations