Graylog

Details

The project is provided under a non-FOSS Server Side Public License (SSPL) which targets specific use, specifically providing the software as a service, with requirements which go far beyond the scope of the software itself, likely to hinder competitive SaaS usage. The project was previously under a GPLv3 license until it was changed in 2021.

While they mostly don’t refer to the project as “free software” or “open source”, they do use “free and open” a lot, while also sometimes inferring the core is open source like on this page which is referenced from their homepage. Looking across recent marketing quickly presented recent examples of the project referring to itself as open source. There are also references to being open source in their codebase, which was queried via GitHub.

The project appears to have raised at least $57m in funding from investors which include Harbert Growth Partners, Piper Sandler Merchant Banking, Mercury Fund, High-Tech Gruenderfonds (HTGF), Integr8d Capital, and Silver Lake Waterman. The project also appears to generate revenue from selling variations of its software, related extensions and support services.