Apocrypha - the extra-biblical books that have remained in the bible of the Orthodox, that have been removed in the Protestant bibles. Aside from these, are there any other books that are considered by Orthodox, on equal par with scripture, that i'm not aware of?
Actually they were removed by the Jews in reaction to Christian usage of the Septuagint. Martin Luther (a very troubled man) erroneously believed they were not authentic; today we know that they are not only authentic, but several of the books were originally written in Hebrew.
Martin Luther also maligned the Book of Esther, because it does not mention God at all (the Septuagint version does). In addition, he suppressed the Epistle of James, and that of Paul to the Hebrews, claiming they were inauthentic and out of step with Christ's teachings.
You see, once you reject the traditions the Apostles have taught, there are no standards and you can do whatever you want. Sola Imagination indeed. Pasadi97 makes great points above.
So, they are not on par with scripture; they are scripture.