Common Lisp Nova Spec
A very clean presentation of the Common Lisp HyperSpec
Style guides for Google-originated open-source projects
Google's style guide for Python code. Obviously not the law, not even always a good suggestion, but worthy of consideration.
SLIME reference card
Handy reference card OF SLIME commands.
Writing a parser
Guide to writing a parser.
A Guide to Parsing: Algorithms and Terminology
As the title says: a guide to parsing. A fairly comprehensive into to issues relating to writing your own parser.
Various intersphinx mappings for Python libraries.
Handy list of intersphinx mappings for various popular Python libraries.