Falckenberg's "History of Modern Philosophy" (English translation, N.Y., 1893). Compare with this the accounts in the histories of philosophy by Ueberweg and Hoeffding (English translation of the latter, London, 1900). Full bibliographies are to be found especially in Ueberweg.
It is well to look at the philosophy of Kant through more than one pair of eyes. Thus, if one reads Morris's "Kant's Critique of Pure Reason" (Chicago, 1882), one should read also Sidgwick's "Lectures on the Philosophy of Kant" (N.Y., 1905).
An Introduction to Philosophy · The Wunder Library — complete classics, free to read, with narration.