Rapid applications development tool and libraries for FPC
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.
Free 32/64/16-bit multi-platform Pascal and Object Pascal compiler
A 32/64/16-bit Pascal compiler for Win32/64/CE, Linux, Mac OS X/iOS, FreeBSD, OS/2, Game Boy Advance, Nintendo NDS and DOS; semantically compatible with Delphi, Borland Pascal and Mac Pascal (partially) with extra features, e.g. operator overloading.
JEDI VCL for Delphi
JVCL is a library of over 600 Delphi components developed by "Project JEDI" members.
“JEDI Math” is a free mathematical library developed under the MPL for Delphi, Kylix, FPC and Lazarus. The library provides routines for matrices/vectors, regression, geometry, physics, equation rendering and raytracing among others.