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A Note About Website Navigation

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For users of screen readers, depending on the screen resolution, the two checkboxes are for opening and closing the side menus that appear to the left and right side of the screen. This is designed both for large screens and for mobile devices with a touch screen. Checking either the main menu or sidebar checkboxes causes the menu to open from the left or right side of the screen, respectively. Clearing the checkox in either the main menu or sidebar closes the menu. The checkboxes are visible to screen readers such as JAWS and NVDA for Windows, Voiceover for Mac, and Orca screen reader for Linux. When a screen reader says "clickable" for both main menu and sidebar, that is for the respective checkboxes. End of explaination.


Here you can download web-based applications I've created by myself.

  • IPv4 Subnetting Practice App

    If you are studying for CompTIA A+, Network+, or Cisco CCNA, you need to know how to do subnetting. An HTML file is self-contained, so you can run it locally in your web browser.


    IPv4 Subnetting running in Firefox
    IPv4 Subnetting running in Firefox
  • Grayson's Simple Note-Taking Web App

    This is a PHP-based web application for writing notes in HTML and viewing notes in your web browser. It's lightweight and only requires Apache and PHP (recommend PHP 7.0 or later). No MySQL or MariaDB database is required. This is great if you have a virtual machine such as VirtualBox, KVM, Xen, or VMWare. Plus, it's cross-platform.


    A home page for a list of courses.
    This image shows the list of course notes.
    A table of content page for the current course notes.
    This shows a table of content for the list of sections of course notes.
    A note for the current section.
    This shows a note that can be viewed in a web browser. Notes can only be edited in a web server.


    Here is a license for GNU Affero General Public License v3.0. I chose the license as I think it's made for web applications, even for web applications that can be used internally, such as in virtual machines. Please do release the source code if you modified the web application so that I (and others) can make use of the source code.