I don't have a proper list, it is more in the back of my head. I did read some of these each: * Erlang VM * sqlite * Linux kernel * Clojure functional data

I don't have a proper list, it is more in the back of my head. I did read some of these each: * Erlang VM * sqlite * Linux kernel * Clojure functional data structures That list may look very pretentious, but I don't try to fully understand the packages. What interests me is (1) the style, and (2) the larger strokes. What kind of idioms are there, and how does it fit together. I think it is pretty hard to get the idea of a software package from reading the code. For that some higher level description or book makes more sense. Generally I think reading source code is very helpful in becoming a better programmer. I don't think the above list is anywhere near a general recommendation. I did rather pick a domain that was intimidating to me, and the reduce ignorance there.