We have developed a free Leaflet plugin for Omeka and would appreciate any and all feedback on issues, theme or plugin conflicts before submitting to Omeka Plugin directory under GPL.
The current title of the plugin is AcuGIS, but this will be changed prior to submitting the plugin.
The plugin can be downloaded at https://www.acugis.com/blogs/new-leaflet-plugin-for-omeka/
Documentation can be found at https://www.acugis.com/docs/omeka-leaflet-plugin/
Please feel free to contact me directly at david (at) acugis (dot) com