AntiAdware! (also known as Adware Atomizer) look good.
http://www.urlvoid.com/scan/greasyfork.org/
Analysis Date 10 seconds ago
Safety Reputation 0/30
Domain 1st Registered ***** (4 months ago)
http://sitecheck.sucuri.net/results/greasyfork.org/
Status: No Malware Detected by External Scan.
Web Trust: Not Currently Blacklisted (10 Blacklists Checked)
http://quttera.com/detailed_report/greasyfork.org
No Malware Detected By Free Online Website Scan On This Website.
Submission date: Sun Feb 8 01:52:10 2015
Server IP address: *****
Country: United States
Server: nginx/1.6.1
Malicious files: 0
Suspicious files: 0
Potentially Suspicious files: 0
Clean files: 98
External links detected: 94
Iframes scanned: 0
Blacklisted: No
Safe site, but scripts may allow access to adult content. The Greasemonkey scripts are always monitored in the forum to prevent malicious content. My preferred alternative to ***** .