The Lazarus IDE is a stable and feature rich visual programming environment for the FreePascal Compiler. It supports the creation of self-standing graphical and console applications and runs on Linux, FreeBSD, MacOSX and Windows.
Aweful!!! this program proclaims write once compile anywhere. I have kept trying several projects and each one has been SO difficult to compile on even 32/64 bit windows that I just gave up each time in favor of a PROPER IDE. PGSQL and Lazarus is like pulling teeth from the very beginning. I honestly don't know why you would favor this to mono/python for cross development. Any one who says this is better than VS needs a head check! Worst IDE Ever!
It's ok, but buggy on Ubuntu 11 and a little old fashioned. I wrote a fairly detailed review on my blog http://wp.me/peIz1-9p and although I personally like Lazarus it doesn't really stack up against something like monodevelop :(