Yes, this is a first for a C&C fan-mod team to release something like this, a canceled official C&C game now released as a mod to three different C&C games.
For RA3: http://www.moddb.com...-ver-10-english
For C&C3 (chinese version -- no english version yet): http://www.moddb.com...chinese-version
For Zero Hour: http://www.moddb.com...on-new-download and English patch: http://www.moddb.com...ish-patch-v1551