PowerBuilder is a ProgrammingLanguage and a RAD application development and deployment tool from 
Sybase.
Do we need a page for this? --
AristotlePagaltzis
PB cannot run on Linux, but I've heard of some people running their PB/Win32 apps under Wine in Linux. I don't know how successful they've been.
EAServer runs on Linux and there is a PBVM for it. Nothing visual (no windows or display-able datawindows), but it's something.
One page links to PowerBuilder: