LootBuster is a small and simple contest game for streamers. You can connect it to your twitch channel, use it as an overlay (it is transparent) and let your viewers compete against each other. They can spawn lootboxes, throw bombs, jump and do self-destruction (LUL).
This tool is ideal as a break-filling game or for giveaways. It is completely randomness based.
The Game is free and you can simply download and use it.