Help finding a plugin

Does anyone know of a free plugin that can achieve similar results as this sites gallery at top of page

the gallery shows a few images and any more it adds a “view all” button that links to a lightbox slider. Not sure but the gallery style might be called a mosaic or a justified gallery, it’s basically one size

• This topic was modified 1 year, 2 months ago by Steven Stern (sterndata). Reason: moved url

The page I need help with: [log in to see the link]