MineExplorer
This program allows you to navigate the filesystem on your computer with a tree-view display. It is primarily built for advanced computers, having features like color-coded file icons, clicking and scrolling, but works for normal computers as well. It works for both the original ComputerCraft mod and CC: Tweaked.
(https://camo.tmpim.com/cd0c5cffb96ea079b7a37851352d8b520c31ac06/68747470733a2f2f6769746875622e636f6d2f5265696d617250422f4d696e654578706c6f7265722f7261772f6d61737465722f73637265656e73686f742e706e67)
Currently, you can press space (or click) to edit files and expand/collapse folders, or press enter to execute programs and cd into folders. You can rename files with F2 and quit the program by hitting Q. I plan on adding more features soon.
To install the program, you can run the (still fairly primitive) installer: pastebin run tCYT5FBf
It will download the files into the /minex folder and add an alias, minex, for running the program anywhere.
The code is free and open source and can be viewed at https://github.com/ReimarPB/MineExplorer