There are soooooo many simple games online that need zero (or next-to-zero) preparation in order to be turned into a speaking activity. They work well as Warmers or Fillers. Here are a few of our firm favourites!
Gamified tools are even helpful when managing classes.
Do you have a class that has challenging behaviour? Promote positive learning with ClassDojo, a free tool used in 90% of US schools. It applies a point system to a class in order to reward positive behaviour.
Ultimately, we want to re-inforce positive behaviour and encourage the whole class to learn. For this reason, giving negative points should be avoided. Achieveable options to earn points could be "speaking in English" or "participating".