I used to work for the Public Knowledge Project (https://pkp.sfu.ca/ https://pkp.sfu.ca/) which has been directly impacting the Open Access movement for years.

I used to work for the Public Knowledge Project (https://pkp.sfu.ca/ https://pkp.sfu.ca/) which has been directly impacting the Open Access movement for years. Not a sexy startup, but they have great reach and have helped many academics publish research papers openly since the early 2000's.