One of the reasons the name was changed from PSP over to "Powtils" was because PSP is already a flooded term (playstation).
There is another PSP called 'Nemesis PSP' and 'Perl Server Pages' and 'Python Server Pages".
Nemesis PSP was a pascal server page HTML scripting system kind of like PHP is. Powtils is different (the other PSP) because web programs are delphi/fpc programs with powtils whereas Nemesis PSP was just a subset scripting language.
Powtils is a compiled Delphi/Freepascal web development kit with many extras. It used to be called PSP but this name was confusing!
Powtils Information:
https://www.google.com/search?q=powtils
http://forums.xisto.com/no_longer_exists/
http://forums.xisto.com/no_longer_exists/