There are eight General Epistles (sometimes called Catholic Epistles, written to a “church universal” audience) that include Hebrews, James, 1 and 2 Peter, 1, 2, and 3 John, and Jude. The author of Hebrews is unknown (though many have historically attributed it to Paul or one of Paul’s associates). James was one of the earliest New Testament writings and was written by James, the half-brother of Jesus (1 Corinthians 15:7). The apostle Peter wrote 1 and 2 Peter. The apostle John (the same author of the Gospel of John and Revelation) wrote 1 John, 2 John, and 3 John. The short Epistle of Jude was written by Jude, another half-brother of Jesus (Jude 1:1).
(Note: Description used with permission from www.gotquestions.org)