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Re:Project Oberon - The Design of an Operating System, a Com... by pjmlp on Monday December 02, 2013 @10:00AM (#6833986)
Oberon-2 was used as basis and extended for Active Oberon, the sucessor OS.

Not sure about EthOS though.

Re:Project Oberon - The Design of an Operating System, a Com... by chokolad on Monday December 02, 2013 @11:43AM (#6834702)
EthOS was Oberon-2 if I am not mistaken. The paper discussed in this link though still uses Oberon (even though paper was updated in 2013).