This is an Introduction to Programming in Emacs Lisp, for people who are not programmers.

not updated anymore it seems but there's lots of good content in here

Julia is a high-level, high-performance dynamic programming language for technical computing, with syntax that is familiar to users of other technical computing environments. It provides a sophisticated compiler, distributed parallel execution, numerical accuracy, and an extensive mathematical function library. The library, mostly written in Julia itself, also integrates mature, best-of-breed C and Fortran libraries for linear algebra, random number generation, FFTs, and string processing. More libraries continue to be added over time. Julia programs are organized around defining functions, and overloading them for different combinations of argument types (which can also be user-defined).

must-see if only for the 90s-era web design

Showmedo is a peer-produced video-tutorials and screencasts site for free and open-source software (FOSS)- with the exception of some club videos, the large majority are free to watch and download.

An in-depth exploration of the art of shell scripting

This paper presents Tinker, a system that permits a beginning programmer to write Lisp programs by providing concrete examples of input data, and typing Lisp expressions or providing mouse input that directs the system how to handle each example. The user explicitly indicates which objects serve as examples, and may present multiple examples that serve to illustrate conditional procedures. The machine records the steps of the computation, and formulates a program to handle the general case.

I used to believe that multimethods were so advanced I would never need them. Well, maybe I still believe that, but here's a quick and dirty implementation of multimethods so you can see for yourself. Some assembly required; advanced functionality left as an exercise for the reader.

Over the years the dominant way to draw curves is to use something called the "Bezier" curve, which is a particularly interesting curve because it can be linked up to other Bezier curves while making the combination still look like a single curve. You might be familiar with these curves if you've ever drawn Photoshop "paths" or worked with vector drawing programs like Flash, Illustrator or InkScape. But what if you need to program them yourself? What are the pitfalls? How do you determine bounding boxes, intersections, extrusion, all the things you might want when you do things with curves? That's what this page is for. Prepare to be mathed.

The Actor Model of Computation, as defined by Carl Hewitt [1] and elaborated by Gul Agha [2], defines three primitive operations. These operations are “Send”, “Create” and “Become”. The “Send” operation transmits an asynchronous message to a known receiver. The “Create” operation constructs a new actor with a specified initial behavior. The “Become” operation defines the behavior used to process the next message received by the current actor. We will examine each of these primitives, focusing on their relationship with various computational concepts. The actor model provides a compact mode of expression. By unpacking this model, we hope to better understand how to take advantage of its power and elegance.

To make people happy, you have to let them feel like they are in control of their environment. To do this, you need to correctly interpret their actions. The interface needs to behave in the way they are expecting it to behave. 

Thus, the cardinal axiom of all user interface design:

A user interface is well-designed when the program behaves exactly how the user thought it would.

As Hillel said, everything else is commentary. All the other rules of good UI design are just corollaries.

What follows, is an extract from the internal wiki at my workplace, that documents the basics of Python ecosystem for web application development for our interns, trainees and experienced developers who shift to Python from other platforms.

One book on python, another on OOP
Seem a bit simple but could be useful

This is a dictionary of algorithms, algorithmic techniques, data structures, archetypal problems, and related definitions. Algorithms include common functions, such as Ackermann's function. Problems include traveling salesman and Byzantine generals. Some entries have links to implementations and more information. Index pages list entries by area and by type. The two-level index has a total download 1/20 as big as this page.

What the heck does "pythonic" mean?

Explains Python new-style objects:

what are <type 'type'> and <type 'object'>

how user defined classes and instances are related to each other and to built-in types

what are metaclasses

New-style implies Python version 2.2 and upto and including 3.x. There have been some behavioral changes during these version but all the concepts covered here are valid. The system described is sometimes called the Python type system, or the object model.

random stuff that's probably good to know...