October 12, 2021 is Ada Lovelace Day!
For Adults:

Chiaverini, Jennifer. Enchantress of Numbers. (Fiction)
Essinger, James. Ada’s Algorithm: How Lord Byron’s Daughter Ada Lovelace Launched the Digital Age.
Seymour, Miranda. In Byron’s Wake: The Turbulent Lives of Byron’s Wife and Daughter.
For Kids:

Hayes, Amy. Ada Lovelace: First Computer Programmer.
McCulley, Emily. Dreaming in Code.

Stanley, Diane. Ada Lovelace, Poet of Science. (Juvenile collection)