Omega is an extension of the TeX typesetting system that uses the Basic Multilingual Plane of Unicode.
At the 2004 TeX Users Group conference, Plaice announced his decision to split off a new project (not yet public), while Haralambous continued to work on Omega proper.
A separate project was started with the goal of stabilizing the code and extending it with e-TeX functionality, known as Aleph, and led by Giuseppe Bilotta.
Aleph alone is not being developed any more, but most of its functionality has been integrated into LuaTeX, a new project initially funded by Colorado State University (through the Oriental TeX Project by Idris Samawi Hamid) and NTG.
It will be a successor of both Aleph and pdfTeX, using Lua as an integrated lightweight programming language.