There are 2 repositories under nonlinear-programming-algorithms topic.
A highly customizable SQP & barrier solver for nonlinearly constrained optimization
MATLAB implementations of a variety of nonlinear programming algorithms.
A trust-region interior-point method for general nonlinear programing problems (GSoC 2017).
This repo collects results of nonlinear optimization solvers on standard benchmark problems
Nonlinear programming algorithms as the (un-)constrained minimization problems with the focus on their numerical expression using various programming languages.