Free Stuff that Does Stuff

Really Simple Software Engineering for those without a Computing Science Degree

An example of some source code in the C programming language

#include stdio.h

int main (void) {

printf (hello world); return 0; }

Really Simple Software Engineering for those without a Computing Science Degree

The compiler is a program that turns source code that humans can read into machine code understood by computers

#include stdio.h

int main (void) {

printf (hello world); return 0; }

Compiler

Really Simple Software Engineering for those without a Computing Science Degree

#include stdio.h

int main (void) {

printf (hello world); return 0; }

Compiler

01001 1001 0101 1110011 0101011 1001 1011001 000011 101 101010101 0101110 01110101 10101010

Now we have a program we can run on our computers

Digital Equipment Corporation PDP7 c.1965

Digital Equipment Corporation PDP11/20 c.1971

Digital Equipment Corporation VAX11-780 c.1977

GNU !?!

GNU stands for:GNU's Not UNIX

So... Free Software: What is it?

FREEDOM 0:The freedom to run the program for any purpose

So... Free Software: What is it?

FREEDOM 1:The freedom to study and modify the program

So... Free Software: What is it?

FREEDOM 2:The freedom to copy the program so you can help your neighbor*

* These people are American

So... Free Software: What is it?

FREEDOM 3:The freedom to improve the program, and release your improvements to the public, so thatthe whole community benefits.

Tux the Famous Penguin

Some examples of Free Software projects

GNU

Some examples of Free Software projects

Linux (or GNU/Linux)

Some examples of Free Software projects

BSD

Some examples of Free Software projects

Mozilla

Some examples of Free Software projects

Firefox

Some examples of Free Software projects

Thunderbird

Some examples of Free Software projects

SeaMonkey

Some examples of Free Software projects

xiph.com

Some examples of Free Software projects

Ogg Vorbis

Some examples of Free Software projects

Ogg Theora

Some examples of Free Software projects

Speex

Some examples of Free Software projects

FLAC