GRASP: An Extensible Tactile Interface for Editing S-expressions

GRASP is a Scheme-based extensible computational environment designed to work with S-expressions on touch screens. It features a powerful extension mechanism as well as a subsystem for handling gesture-based input. It is implemented in Kawa Scheme, and can be compiled as an Android application as well as run on a desktop windowing environment and inside of terminal
emulators.

GRASP is still a work-in-progress application, so the purpose of the demo is:
- to show the current state of the application;
- to convey the ultimate vision behind GRASP;
- to present the development plan and methodology, and optionally:
- to describe the hitherto history of the development.