6 classes are annotated with GridStackEngine in GridStack 8.2

Bootstrap3 in src/Plugin/gridstack/engine/Bootstrap3.php

Provides a GridStack Bootstrap 3 layout engine.

Bootstrap4 in src/Plugin/gridstack/engine/Bootstrap4.php

Provides a GridStack Bootstrap 4 layout engine.

Foundation5 in src/Plugin/gridstack/engine/Foundation5.php

Provides a GridStack Foundation5 layout engine.

GridStackJs in src/Plugin/gridstack/engine/GridStackJs.php

Provides a GridStack JS layout engine.

GridStackNative in src/Plugin/gridstack/engine/GridStackNative.php

Provides a GridStack native CSS Grid layout engine.

Variant in src/Plugin/gridstack/engine/Variant.php

Provides a shadow variant layout engine.