I have installed, set up, and maintained the following sites using the Omeka platform for content management and web publishing:
You can also see an example in which I have taken an existing theme for Omeka and customized the functionality for media display, for displaying different metadata for different item types, and for displaying related items: https://www.ardenkirkland.com/work/wp-content/uploads/2014/06/kirklandomekaphpexample.pdf