User blog comment:Hawkeye2701/Angelic Immortality?/@comment-3517267-20130626152850

Some of the remains of the Angels get a new life in ANIMA. Parts of Angels are used for the Angel Carriers and some intact S² Engine are used to power the Evangelions. Outside of that, I don't think there have been any mention of that in other Eva works. Fact is, in the anime, the technology part of the Eva world isn't very present. ANIMA is more precise about that part and I think we can safely assume it is fairly canon in that department.