Graylog

Graylog is an open-core SIEM and log management vendor whose platform began as founder Lennart Koopmann's open source project and now spans Graylog Security, Graylog Enterprise, Graylog Open, and Graylog API Security. More than 200,000 IT and security professionals use Graylog every day, and the company serves over 60,000 organizations worldwide, with a focus on lean security teams, MSSPs, and regulated industries. Graylog was named in the 2025 Gartner Magic Quadrant for SIEM and positioned as a Leader and Outperformer in GigaOm's 2025 Radar Report for SIEM.