Does anyone use/add beneficial Insects/ Organisms?

[Cymbaline]

I apologize if this should be in the Pest / Disease board. I wasn't sure if qualified.

I am curious however if anyone adds beneficial insects or organisms to your plants or greenhouses?

I was trying to find more info about springtails and I read that they eat disease causing fungi? I thought that maybe a good thing for my orchids and house plants perhaps.

I also know some people add ladybugs and lace wings to their plants.

So I am curious what if anything do you guys add and why? Also if they are used indoors or in a greenhouse .. does the population get out of control if measures aren't taken?