Ever since the release of version 1.0, Oubliette has been distributed under Mozilla Public License (MPL). Full source code is available from the Downloads section. (Borland Delphi 6 is required to compile the latest version; Delphi 3 to compile an earlier version, 1.4)
Oubliette 2.0 is now under design. It will offer several new features and a significant enhancement of the user interface. Further details will be announced here; please check this page occasionally.