Thanks for your comments. I'll update Code Climate link.
Yes, saying that Github, jClarify and Lighthouse have free for open source plans is technically incorrect. But given that they can all* be used by open source projects, for free, in ways that they could not be used by typical commercial projects I think the simplification is permissible.
* Lighthouse do have a free plan. "Create as many Open Source Projects as you wish on any plan! Even the free plan!"