Zotero reference manager: free and open source
Score: 13
Created: Jan 15 '16 at 20:03
Clicks per day: 0.44 (669 total)
Retraction Watch
Score: 20
Created: Jan 15 '16 at 20:15
Clicks per day: 0.59 (907 total)
arXiv.org: the leading open access eprint repository
Score: 28
Created: Jan 16 '16 at 0:22
Clicks per day: 0.38 (584 total)
Detexify: automated LaTeX symbol recognition
Score: 16
Created: Jan 16 '16 at 0:28
Clicks per day: 0.74 (1,129 total)
The Cost of Knowledge - join the Elsevier boycott and take back our scientific publishing!
Score: 13
Created: Jan 16 '16 at 0:35
Clicks per day: 0.54 (832 total)
cryptography.stackexchange.com
Score: 11
Created: Jan 16 '16 at 22:31
Clicks per day: 0.58 (889 total)
Are your papers available in an open access repository? Check with Dissemin
Score: 10
Created: Jan 18 '16 at 7:39
Clicks per day: 0.5 (765 total)
Pubpeer.com
Score: 15
Created: Jan 18 '16 at 12:09
Clicks per day: 0.46 (704 total)
History of Science and Mathematics at Stack Exchange
Score: 21
Created: Jan 18 '16 at 19:43
Clicks per day: 0.57 (867 total)
Computational Science at Stack Exchange
Score: 16
Created: Jan 19 '16 at 2:16
Clicks per day: 0.56 (864 total)
Haikus are awesome/ Chemistry is more so/ Ask straight away!
Score: 12
Created: Jan 19 '16 at 7:50
Clicks per day: 0.44 (680 total)
Wayback Machine: experience the Web as it was
Score: 14
Created: Jan 19 '16 at 14:26
Clicks per day: 0.53 (806 total)
archive.org - the public library of the internet
Score: 8
Created: Jan 19 '16 at 19:45
Clicks per day: 0.48 (731 total)
Tagline to show on mouseover
Score: 14
Created: Jan 19 '16 at 20:14
Clicks per day: 0.43 (666 total)
For those seeking down-to-earth answers to their questions
Score: 10
Created: Jan 27 '16 at 8:55
Clicks per day: 0.56 (847 total)
Law.SE
Score: 7
Created: Feb 2 '16 at 15:06
Clicks per day: 0.14 (212 total)