Everlightbox works with wpforo and WP posts/pages. Though the wpforo gvectors embeds lightbox is faster.
Exopite Lightbox35 has an impressive interface.
IW Magnific Popup is superfast.
Modified Slimbox2 is nice.
wpforo attachments addon's integrated lightbox is Blueimpl Lightbox available at:
https://wordpress.org/plugins/blueimp-lightbox/
It's one of the best. In order to have a consistent interface between wpforo and wordpress posts, I've installed this standalone plugin on my site ( https://egpu.io ) and disabled wpforo attachment addon's lightbox (Blueimp).
Ensure you make this mod to show navigation buttons upon opening the image gallery if wanting to try it:
https://wordpress.org/support/topic/always-visible-navigation-whan-open-photo/#post-4722140
These Simple CSS customizations gives the appearance of the wpforo attachment addon's lightbox (nav arrows, close button)
/* blueimp - set wpforo attachments addon lightbox look*/
#blueimp-gallery img {width: auto !important; height: auto !important; margin: auto !important;}
.blueimp-gallery-controls .close, .blueimp-gallery-controls .title{color: white !important;font-size: 2em !important;}
.blueimp-gallery > .prev, .blueimp-gallery > .next{border: unset; margin-top: unset; background:#F1F1F1 !important;font-weight:bold !important;line-height:36px !important; font-size: 1em !important;}
.blueimp-gallery > .indicator > li {border: unset; margin: unset; opacity: unset; box-shadow: unset;}
.blueimp-gallery > .indicator {line-height: unset;}
