SOC Prime
SOC Prime is a marketplace of Sigma rules for the latest and greatest exploits and vulnerabilities.
The company pays security researchers a bounty every time their content is used, and allows subscribers to rate the content to determine how big a payout they get.
They are also the makers of tools like Uncoder, to convert one standard Sigma rule into a range of other search syntax languages, and Uncoder AI, an augmented intelligence framework powered by collective industry expertise and backed by Sigma and MITRE ATT&CK® as code assistants.