Dylan was created in the early 1990s by a group led by Apple Computer. At one point in its development it was intended for use with Apple's Newton computer, but the Dylan implementation did not reach sufficient maturity in time, and Newton instead used a combination of C and the NewtonScript developed by Walter Smith. Apple ended their Dylan development effort in 1995, though they made a "technology release" version available ("Apple Dylan TR1") that included an advanced IDE.
Originally released under Mac OS 7 and 68k processors, it was patched over the years by Apple to run on PowerPC processors up through Mac OS 9.2.2, but not in the Classic environment of Mac OS X. If you choose not to buy the original Mac OS 7 version of Dylan Technology Release, you can download the open source version which runs on a variety of platforms, including PPC- and Intel-based Mac OS X systems from: