[smackeyacky]

There were 3 different libraries that impressed me:

1. The SunOS headers. Couldn't see the code but the number of header files was small enough in the 4.x Sun libraries that you could read them all. Mostly the documentation was terse but information dense.

2. The TeX sources. Knuths literate programming seems like such a missed opportunity.

3. ParcPlace VisualWorks. Due to the nature of Smalltalk you could read all the source code, learn object patterns directly from the people who invented it. A great learning experience when transitioning from C and so much better than the cfront based C++ hack.