In addition to HTTP/2 <https://en.wikipedia.org/wiki/HTTP/2> which is a
further development of the SPDY protocol, there's now HTTP/3:
<https://en.wikipedia.org/wiki/HTTP/3>. That seems to be the new name of
HTTP-over-QUIC. According to the table in the Wikipedia article, support
was just added to the major browsers.

Wikipedia gives the impression that both HTTP/2 and HTTP/3 were
primarily developed at Google.

QUIC seems to be a next-generation TCP that can serve multiple
independent streams in parallel over one connection. Encryption is also
baked in at the packet level somehow. It runs on top of UDP.