Sing! Karaoke by Smule - Karaoke with your favorite celebrity singers
PhotoGrid - Picsart removed a lot of grid options from its collage feature, and limited the amount of pictures to 10. While this app is inferior to Picsarts quality, it lets you choose max 15 pictures and has numerous layouts.
iSing Karaoke - iSing Karaoke is free to use the Karaoke app that offers free access to hundreds of songs.
WeSing - WeSing is a free Karaoke sing application that lets you sing your own cover of top songs from a massive catalogue and sing karaoke song and record like a star you are.
Karaoke Online - Karaoke Online: Sing & Record developed and published by Aloha Std.
Singa - Singa is the best way to sing karaoke on mobile or tablet.