Here are quite a few Apocrypha Books backing up the story of Jesus and the Gospel.
http://www.electrosnap.com/Frames2/Apocrypha/Apocrypha_frames_page.htm
List of Books, the link is in frames.
Book of Jubilees
Gospel of Thomas
Book of Jasher
Book of Didache
1 Clement to the Corinthians
2 Clement to the Corinthians
1 book of Esdras
2 book of Esdras
1 book of the Maccabees
2 book of the Maccabees
1 book of Baruch
2 book of Baruch
3 book of Baruch
1 book of Enoch
2 book of Enoch
Complete books of Enoch
Epistle of Barnabas
Testaments 12 patriarchs
Greek additions to Esther
Addition to Esther
The book of Tobit
The book of Judith
The wisdom of Solomon
Psalms of Solomon
Odes of Solomon
Sirach (or ecclesiasticus)
The epistle of Jeremiah
The book of Susanna (in daniel)
The prayer of Azariah
The prayer of Manasseh
Bel and the dragon (in Daniel)
Books of Adam & Eve
Slavanic Life of Adam/Eve
The letter of the Smyrnaeans or the Martyrdom of Polycarp
The Shepherd of Hermas
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Apocryphal Apocalypse
The Apocalypse of Adam
The Revelation of Esdras
1st Apocalypse of James
2nd Apocalypse of James
The Apocalypse of Paul
Fragments-The Apocalypse of Paul
The Apocalypse of Peter
Fragments-The Apocalypse of Peter
The Revelation of Stephen
The Apocalypse of Thomas
The Apocalypse of the Virgin