OOo code- how to see it?

Hello!
Please, in which language is OOo written, and is is it possible to see it’s code and how?
Many thanks!

http://www.libreoffice.org/developers/

The source for v4.1.2.3 can be found here. LO is written in many different languages, although the two main ones are C++ and Java (and Java is slowly being removed). Here is a list of languages detected by the sloccount tool (some of which may be false positives):

Totals grouped by language (dominant language first):
cpp:        3996143 (83.80%)
java:        375614 (7.88%)
xml:         225320 (4.73%)
ansic:        76717 (1.61%)
perl:         36573 (0.77%)
python:       25972 (0.54%)
sh:            9185 (0.19%)
yacc:          8144 (0.17%)
cs:            6620 (0.14%)
objc:          2747 (0.06%)
lex:           2029 (0.04%)
asm:           1574 (0.03%)
pascal:         826 (0.02%)
awk:            807 (0.02%)
lisp:           115 (0.00%)
php:            104 (0.00%)
csh:             46 (0.00%)
sed:              7 (0.00%)

As @mariosv indicates though, you should contact the developers for further queries related to the code.