Count of repositories in GitHub Archive by language as calculated using Faunus. See http://hortonworks.com/blog/big-graph-data-on-hortonworks-data-platform/ for details.

gistfile1.txt

Apex  308
Arc	29
Assembly	1312
Augeas	19
AutoHotkey	329
D	1667
DCPU-16 Assembly	2
Dart	575
Delphi	974
Erlang	5503
Factor	54
Fancy	13
Fantom	12
Go	6548
Groovy	5140
Ioke	7
Java	159526
Kotlin	66
Lua	6000
Max/MSP	8
Mirah	26
Modelica	34
Nemerle	94
Objective-J	295
OpenEdge ABL	111
Powershell	86
Pure Data	202
Rebol	69
VHDL	373
XQuery	145
null	698396
ASP	763
AppleScript	70
Boo	47
Bro	22
C#	37912
C++	60487
Clojure	8068
ColdFusion	971
Coq	149
Dylan	53
Ecl	8
Eiffel	126
Emacs Lisp	9956
F#	646
FORTRAN	745
Gosu	65
JavaScript	263316
Julia	172
Matlab	2047
Max	1
Nimrod	29
Nu	23
Opa	70
Parrot	24
PowerShell	951
Puppet	4281
Racket	750
Scilab	103
Shell	44263
Standard ML	148
SuperCollider	131
Tcl	471
Verilog	435
eC	5
ooc	59
ActionScript	5743
Ada	158
Arduino	2020
C	68315
Ceylon	11
CoffeeScript	10163
Common Lisp	2550
DCPU-16 ASM	120
Elixir	157
HaXe	787
Haskell	8762
Io	83
Logtalk	7
OCaml	1405
Objective-C	47026
PHP	144112
Perl	24572
Prolog	847
Python	145350
R	3427
Ruby	243429
Rust	470
Scala	11247
Scheme	1273
Self	6
Smalltalk	235
Turing	34
Vala	349
VimL	26243
Visual Basic	1743

C# is right after perl and vim. windows+git must be a nightmare :)