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Open Prolog supports many features of ISO Prolog, including disjunctive calls, negation, if-then and if-then-else, program originated catch and throw exception handling, the "logical" assert and retract of Lindholm & O'Keefe, automatic memory management and garbage collection (except for the name table), etc. It runs on Apple Macintosh machines running Mac OS 7.5.5 and later, as well as under the Classic environment of Mac OS X. The program is postcardware.
PXPerl is a Perl distribution for Windows 2000 and XP. You can select at installation time which modules from CPAN you want installed (such as ImageMagick, GD, etc). It includes Parrot and a free text editor (SciTE). It also integrates with Windows Explorer to edit, run and test scripts.
This is a well-known port of the Perl distribution for Windows programmers. They also have binaries for AIX, HP-UX, Linux, Mac OS X and Solaris.
You can get the source code for Perl (including the versions under development) from this site.
mod_perl is an embedded Perl interpreter for the Apache web server. Since it is integrated into the HTTP server, the server does not need to start a separate Perl interpreter process to interpret your scripts, possibly reducing the overhead on your server and improving the response times of your script-driven pages.
If you use a Macintosh, you might be interested to know that there is a Perl port. There are versions for both the 68K and PowerPC processors. It can run under the Mac OS Finder or the Macintosh Programmers Workshop (MPW) (which you can also get free - see the Free C/C++ Compilers page for details). It is not just a port since it also includes additional Macintosh-specific features.
CPAN - Comprehensive Perl Archive Network CPAN is a massive repository of Perl resources, from Perl modules, scripts, binary distributions or ports, source code, and so on.
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