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” 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 -- 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 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 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.
