ID:275910
 
This is the most customizable software application on the planet!

How was it made?!
When a mommy BYOND and a daddy BYOND love each other...
Some very smart people with a huge knowledge of C/C++, html, etc. Of course, some it it was designed by users (then that would be what you mean by customizabe, huh?)
In response to Crashed
old topic- search the forums for a known history of BYOND.