Stack Overflow

professional and enthusiast programmers
User
8.455.507
Votes
115.268.681
Comments
77.273.429
Questions
15.406.704
Answers
23.957.096
Solved Questions
8.233.484
Unsolved Questions
4.434.699

Server Fault

system and network administrators
User
351.850
Votes
1.742.886
Comments
1.054.816
Questions
256.612
Answers
426.019
Solved Questions
127.044
Unsolved Questions
55.823

Super User

computer enthusiasts and power users
User
608.140
Votes
2.877.360
Comments
1.710.363
Questions
369.753
Answers
548.590
Solved Questions
156.757
Unsolved Questions
119.441

Meta Stack Exchange

meta-discussion of the Stack Exchange family of Q&A websites
User
196.746
Votes
2.312.899
Comments
835.726
Questions
85.521
Answers
126.231
Solved Questions
41.004
Unsolved Questions
10.779
Web Applications
power users of web applications
User
110.085
Votes
249.578
Comments
79.491
Questions
23.662
Answers
34.171
Solved Questions
9.158
Unsolved Questions
3.884

Arqade

passionate videogamers on all platforms
User
117.007
Votes
1.175.153
Comments
400.171
Questions
81.431
Answers
135.937
Solved Questions
50.909
Unsolved Questions
5.885

Webmasters

pro webmasters
User
64.618
Votes
183.838
Comments
117.697
Questions
29.079
Answers
45.838
Solved Questions
12.871
Unsolved Questions
1.700

Seasoned Advice

professional and amateur chefs
User
41.796
Votes
294.130
Comments
112.785
Questions
18.715
Answers
46.160
Solved Questions
9.695
Unsolved Questions
530
Game Development
professional and independent game developers
User
85.927
Votes
391.105
Comments
232.172
Questions
41.286
Answers
64.593
Solved Questions
22.340
Unsolved Questions
5.601

Photography

professional, enthusiast and amateur photographers
User
46.629
Votes
313.985
Comments
141.705
Questions
20.600
Answers
50.671
Solved Questions
10.857
Unsolved Questions
616

Cross Validated

people interested in statistics, machine learning, data analysis, data mining, and data visualization
User
152.323
Votes
744.035
Comments
542.870
Questions
119.724
Answers
114.414
Solved Questions
37.365
Unsolved Questions
47.183

Mathematics

people studying math at any level and professionals in related fields
User
414.182
Votes
5.626.155
Comments
4.749.729
Questions
908.513
Answers
1.277.844
Solved Questions
479.137
Unsolved Questions
203.229
Home Improvement
contractors and serious DIYers
User
53.130
Votes
236.516
Comments
184.419
Questions
36.022
Answers
61.539
Solved Questions
13.338
Unsolved Questions
5.159

Geographic Information Systems

cartographers, geographers and GIS professionals
User
83.230
Votes
555.084
Comments
371.276
Questions
94.157
Answers
111.281
Solved Questions
37.026
Unsolved Questions
19.476

TeX - LaTeX

users of TeX, LaTeX, ConTeXt, and related typesetting systems
User
124.388
Votes
1.849.512
Comments
892.516
Questions
150.721
Answers
197.474
Solved Questions
92.013
Unsolved Questions
10.482
Ask Ubuntu
Ubuntu users and developers
User
541.592
Votes
2.309.414
Comments
1.383.526
Questions
284.698
Answers
368.477
Solved Questions
97.029
Unsolved Questions
93.747

Personal Finance & Money

people who want to be financially literate
User
45.565
Votes
323.631
Comments
132.530
Questions
20.952
Answers
40.447
Solved Questions
9.871
Unsolved Questions
1.312

English Language & Usage

linguists, etymologists, and serious English language enthusiasts
User
197.199
Votes
1.437.693
Comments
873.574
Questions
93.527
Answers
219.481
Solved Questions
46.722
Unsolved Questions
5.954
Stack Apps
apps, scripts, and development with the Stack Exchange API
User
33.851
Votes
24.483
Comments
12.178
Questions
2.375
Answers
2.355
Solved Questions
872
Unsolved Questions
910
User Experience
user experience researchers and experts
User
84.318
Votes
433.516
Comments
160.590
Questions
25.569
Answers
68.095
Solved Questions
12.819
Unsolved Questions
798

Unix & Linux

users of Linux, FreeBSD and other Un*x-like operating systems
User
241.869
Votes
1.334.656
Comments
654.074
Questions
134.692
Answers
202.786
Solved Questions
65.384
Unsolved Questions
31.514
WordPress Development
WordPress developers and administrators
User
102.628
Votes
339.325
Comments
381.009
Questions
85.297
Answers
107.710
Solved Questions
41.014
Unsolved Questions
24.276
Theoretical Computer Science
theoretical computer scientists and researchers in related fields
User
32.368
Votes
207.783
Comments
74.809
Questions
9.301
Answers
13.594
Solved Questions
4.331
Unsolved Questions
2.282

Ask Different

power users of Apple hardware and software
User
193.347
Votes
677.360
Comments
345.925
Questions
89.250
Answers
133.088
Solved Questions
33.968
Unsolved Questions
26.371
Role-playing Games
gamemasters and players of tabletop, paper-and-pencil role-playing games
User
29.217
Votes
764.878
Comments
157.889
Questions
25.919
Answers
62.622
Solved Questions
17.788
Unsolved Questions
84

Bicycles

people who build and repair bicycles, people who train cycling, or commute on bicycles
User
25.204
Votes
172.034
Comments
94.847
Questions
11.139
Answers
27.571
Solved Questions
5.868
Unsolved Questions
303

Software Engineering

professionals, academics, and students working within the systems development life cycle
User
245.412
Votes
1.993.372
Comments
707.579
Questions
48.364
Answers
146.032
Solved Questions
28.353
Unsolved Questions
2.690

Electrical Engineering

electronics and electrical engineering professionals, students, and enthusiasts
User
124.025
Votes
805.135
Comments
777.089
Questions
95.782
Answers
169.599
Solved Questions
48.831
Unsolved Questions
9.674
Android Enthusiasts
enthusiasts and power users of the Android operating system
User
158.792
Votes
292.344
Comments
208.496
Questions
47.258
Answers
57.419
Solved Questions
13.604
Unsolved Questions
19.899

Physics

active researchers, academics and students of physics
User
127.256
Votes
1.020.997
Comments
730.201
Questions
114.401
Answers
166.699
Solved Questions
48.635
Unsolved Questions
23.628

Information Security

information security professionals
User
132.371
Votes
767.964
Comments
290.781
Questions
45.048
Answers
83.653
Solved Questions
21.551
Unsolved Questions
3.589
Graphic Design
Graphic Design professionals, students, and enthusiasts
User
78.711
Votes
239.387
Comments
122.523
Questions
23.846
Answers
43.419
Solved Questions
10.880
Unsolved Questions
2.109
Database Administrators
database professionals who wish to improve their database skills and learn from others in the community
User
117.598
Votes
445.726
Comments
281.600
Questions
63.180
Answers
85.099
Solved Questions
30.413
Unsolved Questions
11.964
Science Fiction & Fantasy
science fiction and fantasy enthusiasts
User
69.773
Votes
1.451.242
Comments
409.372
Questions
46.242
Answers
89.273
Solved Questions
27.310
Unsolved Questions
3.147

Code Review

peer programmer code reviews
User
137.716
Votes
585.946
Comments
283.479
Questions
51.280
Answers
81.804
Solved Questions
29.693
Unsolved Questions
5.041

Programming Puzzles & Code Golf

programming puzzle enthusiasts and code golfers
User
59.737
Votes
722.593
Comments
283.720
Questions
9.286
Answers
114.416
Solved Questions
4.947
Unsolved Questions
90

Quantitative Finance

finance professionals and academics
User
20.721
Votes
77.015
Comments
43.759
Questions
10.358
Answers
13.833
Solved Questions
4.024
Unsolved Questions
2.400
Skeptics
scientific skepticism
User
29.942
Votes
337.710
Comments
124.526
Questions
8.379
Answers
10.497
Solved Questions
4.129
Unsolved Questions
1.090
Drupal Answers
Drupal developers and administrators
User
50.594
Votes
392.250
Comments
260.545
Questions
75.815
Answers
97.374
Solved Questions
34.359
Unsolved Questions
23.239

Motor Vehicle Maintenance & Repair

mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
User
24.613
Votes
140.334
Comments
74.580
Questions
15.265
Answers
24.474
Solved Questions
5.949
Unsolved Questions
2.122

SharePoint

SharePoint enthusiasts
User
47.885
Votes
243.632
Comments
220.151
Questions
79.047
Answers
101.169
Solved Questions
31.120
Unsolved Questions
26.409

Music: Practice & Theory

musicians, students, and enthusiasts
User
31.254
Votes
192.997
Comments
84.647
Questions
12.552
Answers
33.475
Solved Questions
6.481
Unsolved Questions
331

Mi Yodeya

those who base their lives on Jewish law and tradition and anyone interested in learning more
User
9.238
Votes
284.404
Comments
208.428
Questions
24.592
Answers
39.097
Solved Questions
8.435
Unsolved Questions
3.737

Japanese Language

students, teachers, and linguists wanting to discuss the finer points of the Japanese language
User
16.518
Votes
182.617
Comments
69.684
Questions
15.072
Answers
23.947
Solved Questions
10.760
Unsolved Questions
122

Philosophy

those interested in the study of the fundamental nature of knowledge, reality, and existence
User
22.614
Votes
108.482
Comments
98.713
Questions
9.588
Answers
22.569
Solved Questions
3.671
Unsolved Questions
913

Travel

road warriors and seasoned travelers
User
50.899
Votes
564.243
Comments
209.366
Questions
28.259
Answers
47.007
Solved Questions
12.444
Unsolved Questions
323
Cryptography
software developers, mathematicians and others interested in cryptography
User
41.161
Votes
147.493
Comments
91.639
Questions
15.247
Answers
19.764
Solved Questions
7.716
Unsolved Questions
1.952
Signal Processing
practitioners of the art and science of signal, image and video processing
User
25.525
Votes
74.652
Comments
72.570
Questions
14.302
Answers
17.790
Solved Questions
6.217
Unsolved Questions
3.319
Christianity
committed Christians, experts in Christianity and those interested in learning more
User
19.848
Votes
216.940
Comments
121.949
Questions
9.862
Answers
23.096
Solved Questions
5.087
Unsolved Questions
253

Bitcoin

Bitcoin crypto-currency enthusiasts
User
53.493
Votes
136.514
Comments
64.086
Questions
19.582
Answers
26.026
Solved Questions
7.528
Unsolved Questions
3.779
Movies & TV
movie and tv enthusiasts
User
41.414
Votes
397.176
Comments
107.681
Questions
14.962
Answers
24.939
Solved Questions
9.178
Unsolved Questions
1.233
Biology
biology researchers, academics, and students
User
28.265
Votes
183.282
Comments
99.957
Questions
18.903
Answers
21.894
Solved Questions
8.535
Unsolved Questions
3.655

Mathematica

users of Wolfram Mathematica
User
37.393
Votes
639.100
Comments
362.766
Questions
49.941
Answers
73.389
Solved Questions
26.961
Unsolved Questions
5.695

Academia

academics and those enrolled in higher education
User
67.238
Votes
764.578
Comments
222.430
Questions
22.444
Answers
52.354
Solved Questions
9.957
Unsolved Questions
801
Computer Science
students, researchers and practitioners of computer science
User
67.430
Votes
207.984
Comments
143.284
Questions
24.148
Answers
29.110
Solved Questions
11.139
Unsolved Questions
4.477

The Workplace

members of the workforce navigating the professional setting
User
58.465
Votes
870.527
Comments
230.027
Questions
17.790
Answers
56.725
Solved Questions
8.822
Unsolved Questions
6

Chemistry

scientists, academics, teachers and students
User
38.152
Votes
258.710
Comments
128.434
Questions
25.408
Answers
29.597
Solved Questions
10.375
Unsolved Questions
4.631

Raspberry Pi

users and developers of hardware and software for Raspberry Pi
User
65.703
Votes
126.039
Comments
104.098
Questions
21.864
Answers
28.696
Solved Questions
7.795
Unsolved Questions
6.314
Salesforce
Salesforce administrators, implementation experts, developers and anybody in-between
User
36.516
Votes
320.527
Comments
271.178
Questions
73.181
Answers
86.026
Solved Questions
32.109
Unsolved Questions
21.060

ExpressionEngine® Answers

administrators, end users, developers and designers for ExpressionEngine® CMS
User
5.451
Votes
38.292
Comments
33.208
Questions
12.014
Answers
15.384
Solved Questions
5.746
Unsolved Questions
2.545
Anime & Manga
anime and manga fans
User
20.328
Votes
131.984
Comments
46.552
Questions
8.930
Answers
13.261
Solved Questions
4.918
Unsolved Questions
1.062

Magento

users of the Magento e-Commerce platform
User
45.675
Votes
256.540
Comments
259.087
Questions
71.290
Answers
83.560
Solved Questions
26.970
Unsolved Questions
25.287

English Language Learners

speakers of other languages learning English
User
53.381
Votes
365.726
Comments
255.844
Questions
47.730
Answers
78.295
Solved Questions
24.246
Unsolved Questions
3.839

Network Engineering

network engineers
User
33.106
Votes
64.679
Comments
69.178
Questions
10.572
Answers
16.108
Solved Questions
5.609
Unsolved Questions
1.143

Blender

people who use Blender to create 3D graphics, animations, or games
User
37.889
Votes
203.653
Comments
147.428
Questions
37.501
Answers
37.046
Solved Questions
15.443
Unsolved Questions
10.464

MathOverflow

professional mathematicians
User
77.260
Votes
1.556.354
Comments
603.913
Questions
89.901
Answers
129.918
Solved Questions
41.897
Unsolved Questions
22.313
Stack Overflow em Português
programadores profissionais e entusiastas
User
77.216
Votes
530.986
Comments
474.132
Questions
95.601
Answers
116.295
Solved Questions
49.497
Unsolved Questions
24.288

Aviation

aircraft pilots, mechanics, and enthusiasts
User
21.984
Votes
283.943
Comments
93.656
Questions
11.462
Answers
22.001
Solved Questions
6.632
Unsolved Questions
377

Software Recommendations

people seeking specific software recommendations
User
29.609
Votes
77.902
Comments
48.303
Questions
14.540
Answers
14.261
Solved Questions
3.162
Unsolved Questions
6.743
Arduino
developers of open-source hardware and software that is compatible with Arduino
User
32.193
Votes
61.638
Comments
82.708
Questions
13.883
Answers
19.618
Solved Questions
5.800
Unsolved Questions
2.707

Data Science

Data science professionals, Machine Learning specialists, and those interested in learning more about the field
User
36.536
Votes
49.130
Comments
25.506
Questions
8.320
Answers
10.020
Solved Questions
2.910
Unsolved Questions
2.450
Puzzling
those who create, solve, and study puzzles
User
33.694
Votes
366.864
Comments
148.705
Questions
11.561
Answers
31.518
Solved Questions
9.660
Unsolved Questions
65
Worldbuilding
writers/artists using science, geography and culture to construct imaginary worlds and settings
User
39.074
Votes
596.163
Comments
274.115
Questions
15.208
Answers
73.515
Solved Questions
8.384
Unsolved Questions
4

Emacs

those using, extending or developing Emacs
User
13.111
Votes
87.845
Comments
49.633
Questions
12.988
Answers
15.120
Solved Questions
6.846
Unsolved Questions
3.054
Stack Overflow на русском
программистов
User
107.808
Votes
736.119
Comments
967.744
Questions
194.363
Answers
232.110
Solved Questions
96.057
Unsolved Questions
46.977

Law

legal professionals, students, and others with experience or interest in law
User
12.003
Votes
51.381
Comments
38.059
Questions
8.461
Answers
10.437
Solved Questions
3.156
Unsolved Questions
1.493
Stack Overflow en español
programadores y profesionales de la informática
User
67.722
Votes
155.533
Comments
229.160
Questions
48.059
Answers
58.258
Solved Questions
21.354
Unsolved Questions
16.574
Ethereum
users of Ethereum, the decentralized application platform and smart contract enabled blockchain
User
29.763
Votes
81.831
Comments
40.419
Questions
15.532
Answers
16.561
Solved Questions
6.036
Unsolved Questions
4.563