I am always on the look for sites and tools to keep my webmastering and site development fast and easy. In my case, I am use macOS 12&13. If you are running a different system/os, you may need to look up different software.
Website Coding & Uploading
Xcode: for editing code.
I have been using Xcode for a while now, just to edit HTML files and CSS. It's great for the native feel of macOS, and it helps me with the colors and autocompleting elements unlike if I was using TextEdit (or Notepad).
Neocities CLI: for uploading files.
The Neocities CLI comes in clutch when I need to mass-upload files on my site. It's free, and there are zero-to-no problems that I have with it. One issue I find annoying is if you upload too much within a day, every single Neocities site just goes POOF for a couple hours, so make sure you don't upload too much.