During the pandemic ABRSM published a free piece a day, find the pieces below:
https://gb.abrsm.org/en/inspire/free-piece-of-the-day/library/
This website has introductory and intermediate music theory lessons, exercises, ear trainers, and calculators. It includes free tools and can be downloaded as an app.
8notes provides sheet music for musicians, currently about 90% of the site is free to use. See their 'about' page for more information in regards to copyright ownership of the music.
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Noobnets is a lady's collection of songs written out in simple letter notation. She posts new songs every week and her moto is 'Play Now, Theory Later'.
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Created by the dedicated Kobe Ip, this website was created to help students with the latest ABRSM grade 5 theory exam since it moved online.
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A brilliant website for any flute teacher or player - it contains many free resources.