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