The site is authored with plain HTML and CSS, via the CodeIgniter PHP framework. The site uses semantic markup, which aids with accessibility.
The site also features a print style sheet, to enable easier printing of pages.
The site was originally created using Dreamweaver CS3. Nowadays, the site is developed using Visual Studio Code on a 2014 era iMac. The time I spend maintaining this site is very sporadic, so is sometimes prone to site-rot. That said, the site is very simplistic, so even on a bad day, it should be at least usable!