Gallery development is continuing!

Brad Dutton has been leading a community that is continuing Gallery development. He and his team have made progress over the past year and have a stable version of Gallery 3 that is PHP 7+ compatible, contains a replacement for the old Flash-based image uploader, an updated jQuery Library and other features. They’ve been testing it for a year now with no problems and have released it as Gallery 3.1.0.

Source: Gallery development is continuing! | Gallery

The above blurb posted 11/13/2019.  The Gallery project went into hibernation in 2014. Sites hosted here, and, use Gallery 2 which still works great.