MNEMS
A Matlab wrapper for the nonlinear equations solver NNES  
What is MNEMS? Credits Install and usage Download
 
MNEMS is a MEX Matlab wrapper for a nonlinear solver called NNES. It is written in C and can be used both in Linux and Windows systems.

System requirements

A Linux or Windows system with Matlab. It was tested with Matlab ver. 6.0, but it should work with older versions.  

NNES

The NNES package can be downloaded from Netlib by following this link  NNES 
Università degli Studi di Bologna