LABS Nodes
LABS nodes are experimental and not intended to be used for production. However they may be helpful for testing and will continue to be developed.
LABS nodes are indicated in Nuke with the tag: 
These nodes are hidden by default. To find them, use the node menu on the left side bar, select the folder icon
, and select All Plugins > Update. Once it has been updated, the full list of nodes will then appear on the All Plugins list under their starting letter.