Carl Loewe: Entry at Wikipedia with internal links to related topics and people.
Johann Karl Gottfried Loewe (1796-1869): Listing at The Lied and Art Song Texts Page with over 400 vocal works. Most have German lyrics; some are also in English, French, Russian, Italian, Greek, Dutch, or Polish
Karl Löwe: Karadar dictionary entry with brief life, links, and portrait.
Loewe, Johann Carl Gottfried: Biography noting his early beginnings and strong efforts in a variety of genres and styles from the Grove Concise Dictionary of Music entry at WQXR radio.