Noppi is a great app for learning notes on a music sheet. It is also possible to answer by trombone slide position.
Emerson's Apps
https://notationtraining.com
volodymyr.senchak.dev
dannydev
https://pureprivacypolice.blogspot.com
Unknown
http://www.happynote.com/
dlyz
https://guitartunio.com/
