There are also a couple of TCPs that are sensitive to the RTT signal in the way you describe, but don't completely stop their window increases, in order to avoid being permanently outcompeted. Illinois is in Linux, and Compound TCP is a Microsoft thing.
Also noteworthy is Westwood+, which uses RTT and window size to compute available bandwidth, then upon receiving a congestion signal it uses the minimum RTT and the bandwidth to infer the correct new window size rather than blindly halving it. This actually works pretty well with AQM's preference for short queues, without sacrificing bandwidth; the main shortcoming is that the smoothed bandwidth estimate tends to be an underestimate during the early phases of the connection, ie at the critical moment of exiting slow start. - Jonathan Morton
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