Free for Review Platforms
This post contains a list of reviewer based platforms that allow users to sign up for the chance to participate in studies and product trials in exchange for their opinion. These programs give out free products with the understanding that the users will follow through on their part. They are free to sign up to and no additional strings attached other than sharing with social media or friends.
There are so many of these that I thought it would be less cumbersome to collect them together instead of posting them back to back. They all essentially offer the same service, and mostly different products. This is a good way to get free full sized products and prizes from companies as well. Note that just because you sign up for one, doesn't mean you will get in. Sometimes you just have to keep trying!