what softwear makes fhg's?
 

Is there any simple softwear that generates fhgs?

Html ? ?

Yes

But is there any softwear that you can create lots of fhg's with ease?

Old school: https://www.digitaldutch.com/arles/overview/index.html

logically, to make FHGs with ease...

create your page, html, header, text, gallery, text link & footer...

gallery by numbers, then use separate folders "site/affiliate-use/FHGs/date/images/"

uploading the fhg index html inside the date so each FHG would be in date order...

a python script ?
php ?

I use Arles by digitaldutch. It's free now, but not supported. It does way more than you would think, but you have a small learning curve. Did I mention it is free? This program was built right the first time. I also use it to make photo galleries in her member's area. It does videos too, although I have not explored that yet. It does a lot. Also you can watermark your pics.

Here is an example fhg using Arles.

https://aussiejewel.com/affiliates/fhg/05/index.htm