According to [0], the illustrations in "ØMQ - The Guide" [1] are made using asciitosvg. See, for example, the illustration following the "Divide and Conquer" heading:

http://zguide.zeromq.org/page:all#Divide-and-Conquer

[0] https://9vx.org/post/simplistic-diagrams-with-ascii-art/

[1] http://zguide.zeromq.org/page:all

This is included on the GitHub page:

https://github.com/dhobsd/asciitosvg/blob/master/logo.svg

but not linked into the README for some reason.

This looks a lot nicer than what is shown on the 0MQ page, or more modern at least.

Sometimes the product have not been polished, or it's a concept, so you need to sell the product before even showing it. Once the customer has made his/her mind they are unlikely to change it. And then you work with the customer to improve the product to meet their expectations. Meanwhile if you would have shown the product/prototype without any selling they would have made up their mind and never come back or given any feedback. I know you are a busy person, and so am I - I just want to see the damn output, I don't have time to run it and see for myself even if it just takes 10 minutes. But if I'm not willing to do that, then it's very unlikely I'll invest in it anyway, even if it's very good.