Non-Linear Least Squares Minimization, with flexible Parameter settings, based on scipy.optimize, and with many additional classes and methods for curve fitting.

End-to-end Lane Detection for Self-Driving Cars (ICCV 2019 Workshop)

Apache Commons Math

A general and flexible factor graph non-linear least square optimization framework

oj! Algorithms

A generalized inverse kinematics solver that supports closed chains for parallel kinematics systems, dynamic reconfiguration, and arbitrary joint configuration based on damped least squares error minimization techniques

Six snippets of code that made deep learning what it is today.

Opt DSL

A beginner-friendly SLAM mini-course with Jupyter notebooks — covering Bayes Filters, Kalman Filters, Particle Filters, and Graph-based SLAM with hands-on Python examples.

Symbolic Fitting; fitting as it should be.

Taking a Deeper Look at the Inverse Compositional Algorithm (CVPR 2019, Oral)

Fitting an Ellipse using a Least Squares method, in Python

Modernized Minpack: for solving nonlinear equations and nonlinear least squares problems

Least squares conformal mapping implemented in C++

A single header-only C++ library for least squares fitting.

A sharing of the learning process of mathematical modeling 数学建模常用工具模型算法分享：数学建模竞赛优秀论文，数学建模常用算法模型，LaTeX论文模板，SPSS工具分享。

FIR & LMS filter implementation in C++ with Python & JAVA wrappers

Least squares adjustment software

Find ellipsoid fit for arbitrary data with python/numpy, plot it or write to file.