S
sttf
BLEST and STTF
BLEST
The source code for the BLEST scheduler is available through e.g. the trunk branch of the official Linux MPTCP git repository.
STTF
STTF is available here, as a patch to Linux MPTCP version 0.91.2.
Just apply the patch and configure Linux to include STTF either as a module or as a built-in kernel feature.