DOS Windowing Library
Richard Hulse has released a DOS windowing library as open source software. From the library's GitHub page: "This library was written around 1990, and was inspired by Radio New Zelaland technician Phil Gibbs' C library, which did essentially the same thing. The library creates a screen buffer and text windows can be created, layered and moved around. When a window is moved, the library rewrites the windows to the screen buffer from top to bottom, and then flushes the buffer directlt to screen memory." The library is written in assembly, and released as open source under the MIT license. Thanks Richard!
Richard also released his GO utility to find files or directories. "GO uses my DOS windowing library to present the file and diretories that are found, and the up and down arrow keys are used to move through the list. Pressing enter takes you to the selection." GO is released under the MIT license. Find it at GO's GitHub page.