A first prototype of PGWin based on Haskell and sml-tk was developed by
ChristophLueth and DavidAspinall in 2003. An updated version is in development,
using Haskell with GTK.
Theorem prover support
DavidAspinall supplied the first native PGIP implementation for Isabelle. Development has been assisted by several Isabelle developers, including MakariusWenzel