I don't think that there is anything else like a Gospel -- or the letters of Paul, for that matter. There are many elements that are similar, but not the full meal deal.
What do you think about the scholarship on gospel genre? E.g. the ones I most frequently cite (both because I like there arguments and because I own most of them)
Bryan, C. (1993). Preface to Mark: Notes on the Gospel in Its Literary and Cultural Setting. Oxford: Oxford University Press.
Burridge, R. A. (2006). Gospels. In J. W. Rogerson & Judith M. Lieu (Eds) The Oxford Handbook of Biblical Studies. Oxford: Oxford University Press. p. 433
Stanton, G. N. (1974). Jesus of Nazareth in New Testament Preaching Society of New Testament Studies Monograph Series 27. Cambridge: Cambridge University Press.
Talbert, C. H. (1977). What is a Gospel? The Genre of the Canonical Gospels. Philadelphia: Fortress Press.
Aune, D. E. (1987). The New Testament in Its Literary Environment. Philadelphia: Westminster.
Frickenschmidt, D. (1997). Evangelium als Biographie: Die vier Evanelien im Rahmen antiker Erzählkunst. Tübingen: Francke Verlag.
Wills, L. M. (1997) Quest of the Historical Gospel : Mark, John and the Origins of the Gospel Genre. London: Routledge.
Incigneri, B. J. (2003). The Gospel to the Romans: The Setting and Rhetoric of Mark's Gospel. Leiden: Brill.