Federacy - Bug bounty and security testing platform.
HackerOne - HackerOne provides a platform designed to streamline vulnerability coordination and bug bounty program by enlisting hackers.
IssueHunt - IssueHunt is a crowd funding service for opensource contributors and owners!
Acunetix - Audit your website security and web applications for SQL injection, Cross site scripting and other...
Trustwave Services - Trustwave is a leading cybersecurity and managed security services provider that helps businesses fight cybercrime, protect data and reduce security risk.
Bounty Jungle - Bounty Jungle is a platform where you can post an annoying coding bug and offer a reward for getting it fixed.