A MATLAB plugin is a folder located in the user home dir.
Documents\AnyWave\Plugins\MATLAB on Windows.
/home/username/AnyWave/Plugins/MATLAB on Linux.
/users/username/AnyWave/Plugins/MATLAB on MacOS.

Requirements

MATLAB.
AnyWave will detect the MATLAB installation when starting but it is also possible to set the path to the MATLAB installation in the Edit->Preferences menu.
About standalone (compiled) plugins: The matching MATLAB runtime must be installed in your system.
On Windows there is nothing special to do, if the Runtime is in the current system PATH, then the standalone plugin will find it.

1. Use the Plugin Creation Assistant

1.1 desc.txt

This file is a simple text file that must contain the following lines:
name = My Plugin
description = Do something on data

1.1.1 optional lines

To tune up the behavior of your plugin you may add some flags to tell AnyWave what you plugin can do:
flags=nodatarequired -> this line will inform anywave that your plugin can run even if no data file is open.
flags=canrunfromcommandline -> this flag indicates that your plugin can be run from the command line.
You can combine flags by separating them with a colon (:)
flags=nodatarequired:canrunfromcommandline

Put your plugin in a submenu, by adding the following line:
category=Process:MyCategory:My plugin
This line will create a sub menu called MyCategory in the Processes Menu of AnyWave and a link to launch the plugin.

1.2 main.m

This is a MATLAB function you can create within MATLAB.

function main(varargin)
args = anywave('init', varargin);
% args contains all the properties related to AnyWave current data file and the plugin context.
% my plugin code starts here

2. Compiled plugin

Using the MATLAB Compiler, you can create a standalone version of your plugin.
AnyWave can call the standalone version of your plugin if you add the following line in desc.txt:
compiled plugin=nameofexefile
Example for Delphos plugin, the desc.txt contains the line:
compiled plugin=delphos.exe

3. check that AnyWave detects your plugin at startup

Close and relaunch AnyWave, your plugin should appear in the Processes menu.

IMPORTANT note about the init function

Before calling any anywave commands in your code, call the init function this way:

args = anywave('init', varargin);

Be sure that your main function accepts varargin (cell array) argument.

function main(varargin)

This will ensure that your plugin can be compiled and run by AnyWave as a standalone application.
The args variable is a structure/dictionnay that contains all useful properties you may use in your plugin.

The anywave application path, the current plugin directory, etc.