In fact it is a Joomla plugin that allows - as the name suggests - to insert a module in an article

Modules Anywhere - Joomla! Extensions Directory

Use

1. Create or locate the name or id of the module to be inserted: for our example it is the Module Who is Online (from id 39) and the Weather Module
2. Insert in the desired article the call to the plugin modules Anywhere ex:

    { module 39} { module 373}