* Der Sohn der Wildnis (The Son of the Wilderness) (1853): His most famous work, a romantic tragedy set in the Canadian wilderness.
* Ingomar, der Barbar (Ingomar, the Barbarian) (1850): A historical drama set in ancient Rome.
* Griseldis (Griselda) (1851): A tragic play based on the popular medieval story of Griselda.
* Die Kreuzfahrer (The Crusaders) (1847): A play set during the Crusades.
He also wrote some poetry and prose, but his plays are his most enduring legacy.
It's worth noting that Halm's work has been criticized for being overly sentimental and melodramatic. However, his plays were immensely popular in his time and continue to be staged today.