Tertuallian’s surviving writings are extensive. The Tertullain Project already has a large amount of information about his writings along with lists of available translations. That information will not be duplicated here.
Tertullian’s “Apology” is probably his most important work. A translation of that work not available at The Tertullian Project is available here:
- Gerald H. Rendall/W. C. A. Kerr (translated ~1930)
- “Tertullian and Marcus Minucius Felix”, Volume 250 of the “Loeb Classical Library” (published 1930) — facsimile