While I myself have done little more than play around with it a couple of times, I know that entire generations have had their first programming experiences with Pascal. If you are/were part of the Pascal-crowd, you can have a look at Free Pascal, an open source compiler for Pascal and Object Pascal.
Free Pascal (aka FPK Pascal) is a 32 and 64 bit professional Pascal compiler. It is available for different processors: Intel x86, Amd64/x86_64, PowerPC, PowerPC64, Sparc, ARM. The discontinued 1.0 version also supports the Motorola 680×0. The following operating systems are supported: Linux, FreeBSD, Mac OS X/Darwin, Mac OS classic, DOS, Win32, Win64, WinCE, OS/2, Netware (libc and classic) and MorphOS.
Free Pascal [via Techie Blog]