Gaume Catechism of Perseverance
Farber's Catechism
Fr. Athanasius Urban Sunday School Teacher's aids
Irish Maynooth Catechism that someone mentioned before from 1951
Msgr Stockman's High School Catechism
And A Manual of Religious Instruction by Provost Wenham
Fr. Schouppe and My Catholic Faith sometimes
I have mentioned multiple catechisms because they are good on various topics, some not so good on other topics, and I combine data from many.
But if I have to look anything up I first go to Trent or Perseverance because it's almost always there.