What SW is used to create these charts?

Factual Questions
1

Here – What SW tool is used to create these charts? The document author is no longer around so I can't ask him. - Album on Imgur

The document author is no longer around so I can’t ask him.

Thanks!

2

Looks like Diagrammix to me.

3

Yes it does to me too. Thanks!

4

Wait a minute, could it be Visio?

https://www.google.com/search?rlz=1C1CHBD_enUS832US832&biw=1307&bih=903&tbm=isch&sa=1&ei=AawKXayiKc3b-wSH37i4Aw&q=Visio+designs&oq=Visio+designs&gs_l=img.3..0j0i7i30l4j0i7i5i30j0i8i7i30l4.3865.4307..4930...0.0..0.101.480.3j2......0....1..gws-wiz-img.XJC2AaYoO3E#imgrc=pAu_09J-yYUBIM:

5

Could be any one of the diagramming/flowchart software out there, including Visio. draw.io is free and pretty decent.

6

I don’t know what was originally used but I could reproduce those diagrams in Word or PowerPoint.

7

seems like a fairly generic mind map.
Maybe also try some of these free online tools: