LablTk is an interface to the Tcl/Tk GUI framework. It allows to develop GUI applications in a speedy and type safe way. A legacy Camltk interface is included. The OCamlBrowser library viewer is also part of this project.
The project page is: https://forge.ocamlcore.org/projects/labltk/
You can find documentation here: https://forge.ocamlcore.org/docman/?group_id=343&view=listfile&dirid=385