Task: Explore Atari 8-Bit ATR Disk Images Using a Web Browser
Needed: Web Browser
Time: 10-15 minutes
Introduction
Original Atari 8-bit computer floppy disks can be imaged and saved to a modern PC for archiving, editing, running on an emulator, or used to write new floppy disks. Nick Kennedy created the ATR disk image format for use with SIO2PC and it has become widely accepted as the standard. I recently ran across an HTML program for exploring ATR files called the ATR Image Explorer. Seems like a very useful and easy to use tool.
Instructions
Download the HTML file here and open with a web browser. Simply drag and drop an ATR file into the purple box. A menu of the file contents will appear. Simply click on one of the files and it will show the source code in the area to the right.
Here is the Github repository.

Comments
This is a great tool for quickly exploring assembly language or Atari BASIC programs stored on an ATR file. It is somewhat limited in the types of files it can open and display. A BASIC XE file was not correctly displayed.
Here is an Atari Age thread on the software.