Musication - percussion and boomwhacker play alongs
Beat Saber - great for practicing beat and rhythm with sticks
Rhythm Imposters - great way to practise identifying rhythms in a fun way.  Sheets to accompany are available on TPT
Rhythm Clapping with Mr Gordon - a Junior High Band teacher - many different levels - good for warm up
Line Riders - shows how the sounds in a piece of music go 'up and down' - includes some competition as students choose a colour of 'rider' and then follow him to the end of the song.  A great start to a Melody unit