"Does anyone here have suggestions on freely licensed serif fonts that focus on readability (non-system fonts)?" Not a serif font...but in 2013 Intel released

"Does anyone here have suggestions on freely licensed serif fonts that focus on readability (non-system fonts)?" Not a serif font...but in 2013 Intel released a sans-serif font called Clear Sans, designed for on-screen legibility. The font was designed and created by type designer Daniel Ratighan and is available under the Apache 2.0 License. https://01.org/clear-sans https://01.org/clear-sans