Various android apps, some free, some on sale. Below list thanks to lachlan1 Floating Shortcuts Pro - $1.99 -> Free; 19 hours left Gravity Home Pro - $1.99 -> Free; 1 day left Bubble Level …
A lot of you probably have this on Steam or console by now but for those who don't you can't really go wrong at 20 cents so I figured I'll post it anyway.