Apple Lisa: 40 Years Later, Now Open Source
This consequently led to the development and launch of Lisa.
But, when it launched, it didn't garner that many sales due to its high price and was considered a commercial failure.
What it succeeded in was that it paved the way for the Macintosh operating system which later took the computing world by storm.
It offered many innovations, with a good GUI being one of the main highlights.
Now, in a recent announcement.
After 40 years of Lisa's release, the Computer History Museum (CHM) has made the source code open.
UPDATE
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The Apple Lisa source code has just been released!
Happy 40th Birthday to Lisa! The Apple Lisa computer, that is. In celebration of this milestone, the Computer History Museum has received permission from Apple to release the source code to the Lisa software, including its system and applications software.
Lisa Office System 3.1 Twiggy dates back to April 1984, during the early Mac era, and it was the equivalent of operating systems like macOS and Windows today. The entire source package is about 26MB and consists of over 1,300 commented source files, divided nicely into subfolders that denote code for the main Lisa OS, various included apps, and the Lisa Toolkit development system.
Later coverage:
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Pioneering Apple Lisa goes “open source” thanks to Computer History Museum | Ars Technica
As part of the Apple Lisa's 40th birthday celebrations, the Computer History Museum has released the source code for Lisa OS version 3.1 under an Apple Academic License Agreement. With Apple's blessing, the Pascal source code is available for download from the CHM website after filling out a form.