There's also the Telegony. Odysseus has a son through Circe who winds up killing him and marrying Penelope. Odysseus son through Penelope, Telemachus, marries Circe. There's some wild stuff that doesn't survive.
Looking through these it’s crazy to find out that The Iliad is only 1 of like 5 original texts on the Trojan war. We’re reading book 2 of a 5 book series