The amount of open source stuff Facebook (Meta) has given us over the years is astounding. pytorch, dall-e, react, react native, graphql, cassandra, tor. Commoditized VR, love my quest 3. Just an incredible track record. We're lucky they release all this stuff for free. The Zuck is one of a kind.
What does not get a lot of attention is the work they have done with OCP (Open Compute: https://www.ocp.org/en-us) to first launch it in 2012 and then nurture and grow it since then.
One project I am really excited to see grow is Overture Maps(https://overturemaps.org/), I think it'll have an impact, from end user perspective, far larger than perhaps all other projects.