Loïc Norgeot at SketchFab has made his collection of low-poly assets available for free! Here's what he has to say about the collection:
A growing collection of scanned props and assets baked to lowpoly models, ideal for optimized rendering, real-time applications or in game engines.
They are free to use, even for commercial projects unless stated otherwise, so have fun with them! Just don't be a prick and sell them, or pretend they are yours :)
And if you create cool stuff out of them, I'd be happy to have a feedback!
There are at least fourteen separate packs of objects. Everything from low-poly people to rocks, fruit, birds, tools and more. One of my favorites in the collection is the low-poly people. Check out the embed below. Note that all of the objects are available for download in the .fbx format. Use this link to check out the collection.