Poetry - This app from the Poetry Foundation has a plethora of poems, some with recordings - I can recommend Almost Ashore by Gerald Vizenor
Chasing Fireflies - Beautiful haiku app with gorgeous artwork and sounds, I love the rain and storm sounds as you move through the seasons
Instant poetry - Fridge magnet poetry you create using provided words backed with your own pictures
If Poems - Good selection and the title poem read aloud by Bill Nighy is a real treat although you may prefer Sea Fever to tie in with the poetry day theme
City Poems - Walking around London is one of my favourite things to do and navigating via poetry gives a novel twist to your perambulations
Shakespeare's Sonnets - Wonderful performances, great to dip in and out of
Have a wonderful National Poetry - I'm sure I will!