In the places I go, there are things that I see

That I never could spell if I stopped with the Z.

I'm telling you this ’cause you're one of my friends.

My alphabet starts where your alphabet ends.

                                                                -- Doctor Seuss

Software Available for Download

Follow the underlined links.

        Macintosh™ Shareware*:

                Wraith Scheme (64-bit application)

                        Wraith Scheme implements the R5 version of the Scheme programming language.

                        This version runs on Macintoshes with Intel processors that can run 64-bit

                        applications, that use Mac OS 10.6 (“Snow Leopard”) or a later Mac OS.  The

                        64-bit version of Wraith Scheme is newer and has more features than the 32-bit

                        version; get this one, not the 32-bit version, if your Macintosh can run it.

                Wraith Scheme (32-bit application)

                        Wraith Scheme implements the R5 version of the Scheme programming language.

                        The 32-bit version is universal binary. I keep it available for users who have older

                        Macintoshes; the 64-bit version is newer, better maintained, and has more features.

                Pixie Scheme II (64-bit application)

                        Pixie Scheme II implements the R5 version of the Scheme programming language.

                        It runs on Macintoshes with Intel processors that can run 64-bit applications, that

                        use Mac OS 10.6 (“Snow Leopard”) or a later Mac OS. Pixie Scheme II was a

                        design and development prototype for Pixie Scheme III; it has fewer features and

                        a simpler user interface than Wraith Scheme.

                Percival

                        “Percival” is a simple pixel-oriented image editor intended for customization and

                        touch-up of icons or similar small images. Percival is universal binary.

                Pixie Scheme

                        Pixie Scheme -- this original version, not Pixie Scheme II or Pixie Scheme III --

                        was released January, 1991. No typo, I really mean 1991. It only runs on very old

                        Macintoshes. I have re-released it for the folks who collect old Macintoshes.


        Macintosh Freeware:

                Red Sky

                        Red Sky is a specialized screen-reddening utility for amateur astronomers who use

                        an Apple Macintosh outside, at night. Red Sky is universal binary.


        iPad™ App:

                Pixie Scheme III

                        Pixie Scheme III implements the R5 version of the Scheme programming language.

                        It runs on the iPad and is for sale in the App Store.


        Source Code:

                Source code for the 64-bit version of Wraith Scheme, for Pixie Scheme II, and for

                        Pixie Scheme III is available under the GNU General Public License.


        Talks and Slides:

                I have given a number of talks on various aspects of my Scheme systems, and on

                        related topics:  Here are links to some of them:


                                Building Wraith Scheme From Scratch (PDF -- 3 June 2011).

                                Parallel Scheme on the Cloud: First Steps (PDF -- 16 November 2010).

                                Thoughts On Massively Parallel Computing (PDF -- 3 May 2010).


   * “Shareware” can mean many things: To me, it means public service. These shareware applications are fully functional as downloaded -- no activation codes, nothing to buy, and no pop-up reminders about shareware donations. (Donations are welcome, if you want to make one.)  Any lack of functionality is likely my fault: Send in a bug report so I can get busy fixing it. (Note that there are occasional “platform-dependent” bugs, which I may not be able to detect, simply because I do not have the right combination of hardware and software to elicit them. So please report bugs!)


    If you need assistance with any of this software, or if you have a complaint, an enhancement request, or a bug report, or even if you are simply curious about how something works, by all means let me hear from you. My EMail address is Jay_Reynolds_Freeman@mac.com.