Flex and Bison

https://www.skenz.it/compilers: Practical part

http://staff.polito.it/silvano.rivoira/FormalLanguagesCompilers/materials.htm: Theory part

http://aquamentus.com/flex_bison.html: Example of Flex and Bison (with C++). Explained very well.

http://en.wikipedia.org/wiki/GNU_bison: A more complex example of the classical calculator.

http://gnuu.org/2009/09/18/writing-your-own-toy-compiler/: Form a program to an executable file (COMPLEX)

http://research.microsoft.com/en-us/um/people/rgal/ar_language/external/compiler.pdf: Guide about Flex and Bison (chapters 1 to 5)

http://www-h.eng.cam.ac.uk/help/tpl/languages/flexbison/: Calculator example

http://www.gnu.org/software/bison/manual/html_node/Examples.html: Examples

http://flex.sourceforge.net/: Flex website

https://www.gnu.org/software/bison/: Bison website