FreeBack - OS2.x only. FreeBack is a very simple package to be used as backdrop for all peoples concerned about heap. It is nearly the most simple Newton-app posible to 

free as much heap as possible (heap usage significantly increases with program complexity). All FreeBack consists of, is a blank screen and an i-button that can be used to launch packages using i++. FreeBack is Freeware by Thorsten Lange