On quick searching it's unclear if there is, eg, an existing open source implementation.�� The opentap.org mentioned at the end of that slide set appears to be gone (replaced by a non-English advertising site).
A year ago there was another open source implementation called release14. But that vanished since then. I have contacted them but nothing back.
Being very cynical here, but there seems to be big money in LI and open source solutions don't seem to last very long...