tcp_bbr(4) on FreeBSD
The text 95b4371a099a, as FreeBSD 15.1-RELEASE, FreeBSD 15.0-RELEASE, FreeBSD 14.5-RELEASE, FreeBSD 14.4-RELEASE, FreeBSD 14.3-RELEASE, FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE shipped it.
TCP Bottleneck Bandwidth and Round-Trip Time Algorithm