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The software ReciPro makes various crystallographic calculations, visualizes a crystal structure, simulates diffraction patterns and TEM image, indexes diffraction spots, plots stereographic projection, and so on.

PHP library for IPv4 subnet calculations, CIDR operations, and network planning.

QUDA is a library for performing calculations in lattice QCD on GPUs.

This project is a merge of several common DateTime operations on the form of extensions to System.DateTime, including natural date difference text (precise and human rounded), holidays and working days calculations on several culture locales.

A Java math library for OpenGL rendering calculations

A python library for quantum information and many-body calculations including tensor networks.

Convenient, safe money calculations in JS

Robust and type-safe date and time calculations for Swift

Sloc, Cloc and Code: scc is a very fast accurate code counter with complexity calculations and COCOMO estimates written in pure Go

Python SI units library: your 'daily driver' for calculations.

A Julia library for efficient tensor computations and tensor network calculations. ITensors.jl is supported by the Simons Foundation's Flatiron Institute.

Rich text editor on the web, featuring live calculations.

An implementation of the Fermionic Neural Network for ab-initio electronic structure calculations

A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.

A calculator for quick simple calculations with a nice user interface and no ads

AI-powered data analysis workbench built for transparency, reproducibility and user control. Inspect the code and evidence behind results, verify calculations through replay, and choose from a wide range of models, including local open-weight models.

FateCat measurement infrastructure for Agents and apps: reproducible Bazi/Ziwei calculations, evidence-oriented reports, FastAPI, Web, Telegram and CLI.