https://www.ethicalads.io/ https://www.ethicalads.io/ is by Read the Docs, which I have a generally positive opinion of. https://www.carbonads.net https://www.

https://www.ethicalads.io/ https://www.ethicalads.io/ is by Read the Docs, which I have a generally positive opinion of. https://www.carbonads.net https://www.carbonads.net is by buysellads, which I have a generally mixed opinion of. There was a similar company called codefund, which has recently shut down and now redirects to ethical ads. All of these are for tech publications and have moderately rigorous applications, with requirements for content and traffic.