Ohloh analyzes the project source code and determines the language of each line of code, excluding comments and blanks.

Language	Code Lines	Comment Lines	Comment Ratio	Blank Lines	Total Lines
C++	18,701,814	7,671,657	29.1%	5,512,408	31,885,879
XML	12,770,236	17,032	0.1%	41,795	12,829,063
C	2,850,157	1,102,602	27.9%	528,649	4,481,408
HTML	1,244,581	440	0.0%	55,884	1,300,905
Java	560,058	284,499	33.7%	97,529	942,086
Python	509,768	142,521	21.8%	108,135	760,424
Autoconf	243,135	381	0.2%	30,086	273,602
Perl	131,182	21,215	13.9%	24,896	177,293
DOS batch script	99,978	16,356	14.1%	17,109	133,443
Objective-C	89,538	11,972	11.8%	15,189	116,699
Tcl	84,933	21,672	20.3%	10,158	116,763
shell script	74,951	10,044	11.8%	6,880	91,875
SQL	69,160	2,138	3.0%	8,549	79,847
Make	50,361	23,218	31.6%	15,630	89,209
JavaScript	48,547	12,474	20.4%	9,648	70,669
Assembly	40,787	9,000	18.1%	6,940	56,727
CSS	14,702	2,336	13.7%	3,191	20,229
XML Schema	13,019	6,304	32.6%	557	19,880
IDL/PV-WAVE/GDL	6,566	0	0.0%	712	7,278
Emacs Lisp	3,008	426	12.4%	503	3,937
XSL Transformation	2,246	250	10.0%	326	2,822
R	1,737	297	14.6%	278	2,312
Ada	1,681	560	25.0%	599	2,840
DCL	1,061	198	15.7%	32	1,291
Pascal	1,044	141	11.9%	218	1,403
C#	879	506	36.5%	230	1,615
D	740	0	0.0%	0	740
TeX/LaTeX	519	1	0.2%	77	597
CMake	457	129	22.0%	121	707
Ruby	405	146	26.5%	109	660
Stratego	368	0	0.0%	108	476
PHP	288	66	18.6%	32	386
Scheme	130	0	0.0%	0	130
Vim Script	109	3	2.7%	13	125
Visual Basic	62	3	4.6%	5	70
AWK	36	6	14.3%	2	44
MetaFont	23	0	0.0%	2	25
Automake	21	29	58.0%	18	68