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

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

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

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

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

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.

]]>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

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

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

**Authors**: A. Allen^{1,2}, R. Nemiroff^{3}, P. Ryan^{1}, J. Schmidt^{1}, P. Teuben^{2
}^{1}Astrophysics Source Code Library

^{2}Astronomy Department, University of Maryland, College Park, MD

^{3}Michigan Technological University, Houghton, MI

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