Tools

Many software tools have been developed by members of the RGES-PIT. These include microlensing light-curve modeling codes, Roman image-level simulation tools, data-level simulation tools, galactic population synthesis modeling codes, and more. All tools are publicly hosted on GitHub.

 
Click on a tool below to access its repository which includes a README file with additional details.

---

Microlensing Modeling Software

• BAGLE — photometric and astrometric microlensing; Maintained: Yes (Moving Universe Lab); Lu et al. (2026)
• eesunhong - microlensing modeling code using image-centered ray shooting; Maintained: Yes (Olmschenk); Bennett & Rhie (1996), Bennett (2010)
• lcbinint — python package with a C++ core for binary-lens microlensing magnification and light-curve calculations; Maintained: Yes (Nunota)
• MicroJAX — fully‑differentiable, GPU‑accelerated software for modeling microlensing light curves produced by binary, and triple lens systems, uses the image-centered ray shooting (ICRS) method of Bennett+2010; Maintained: Yes (Miyazaki); Miyazaki & Kawahara (2025)
• muLAn — Roman microlensing light‑curve fitting; Maintained: No (Cassan/Ranc); Ranc & Cassan (2018)
• MulensModel — user‑friendly single/binary lens fitting; Maintained: Yes (Poleski); Poleski & Yee (2019)
• pyLIMA — modeling and simulation toolkit; Maintained: Yes (Bachelet); Bachelet et al. (2017)
• RTModel — hands‑off model fitting with built‑in interpretation; Maintained: Yes (Bozza); Bozza (2024)
• sfit_minimizer — fitting utilities; Maintained: Yes; Yee & Gould (2025)
• SingleLensFitter — single‑lens fits with finite‑source effects; Maintained: No (Albrow)
• triplelens — light curves and image positions for triple systems; Maintained: No (Kuang); Kuang et al. (2021)
• VBBinaryLensing — contour integration approach to binary lenses; Maintained: No; Bozza (2010)
• VBMicrolensing — contour integration; single/binary/multiple lenses; Maintained: Yes (Bozza); Bozza et al. (2025)

Simulation Software

• Butterpy — simulate starspot evolution and corresponding lightcurves; Maintained: Yes (Claytor); Claytor (2022)
• Dazzle — over‑sampled image construction, difference‑imaging, transient detection, and difference‑image PSF photometry; Maintained: Yes (Albrow); Albrow (2025)
• GULLS — microlensing survey simulator; Maintained: Yes (Penny); Penny et al. (2013)
• gapmoe — code to construct Galactic microlensing priors from event-local histogram products generated by genulens; Maintained: Yes (Nunota)
• genulens — simulate microlensing events using the Koshimoto Galactic model; Maintained: Yes (Koshimoto); Koshimoto, Baba, & Bennett (2021)
• PopSyCLE — code to simulate a model of the Milky Way including compact objects and multiple systems and perform a mock microlensing survey; Maintained: Yes (Lu); Lam et al. (2020)
• SynthPop — generate synthetic star catalogs following specified models and configurations; Maintained: Yes (Huston); Klüter & Huston (2025)

Miscellaneous

• GBTDS Optimizer — survey optimization utilities; Maintained: Yes (Penny)
• jacscanomaly — python package for scan-based anomaly detection in time-series light curves.; Maintained: Yes (Nunota)
• nbi — posterior estimation using neural bayesian inference; Maintained: Yes (Zhang); Zhang, Bloom, & Hernitschek (2023)
• popclass — probabilistic lens classification; Maintained: Yes (LLNL); Sallaberry et al. (2025)
• pyLIMASS — physical property estimates for lens systems; Maintained: Yes (Bachelet); Bachelet, Hundertmark, Calchi Novati (2024)
• THOR/HAMRR — data reduction pipeline and catalog service for precursor datasets in Roman GBTDS fields; Maintained: Yes (Terry); Terry & Anderson (2026)

We would like this to be a comprehensive list. If you have an open-source code you would like to contribute, please tell us about it using the submit form.