The Free Software Foundation encourages selling free software. As the Foundation has written, "distributing free software is an opportunity to raise funds for development. Don't waste it!". For example, the FSF's own recommended license (the GNU GPL) states that "[you] may charge any price or no price for each copy that you convey, and you may offer support or warranty protection for a fee."
The best thing about some of these companies is that you don't have to "Like" them on Facebook, send messages on Twitter, or complete surveys. With the companies I've listed first, simply sign in, input your mailing information, and wait for the free sample to show up in your mail). It will take less than 15 minutes sign up and up to six weeks for samples to arrive.
Our favorite messaging service takes security seriously—it's Snowden-approved!—using its own open-source protocol to do end-to-end encryption, even on voice calls. It's not as much fun as some of the others, but still supports sending photos and video, plus group messaging. On Android, Signal can completely replace the SMS texting app; on iPhone you need to get other users to download Signal or you can't talk to them.
Instant wins: When you collect a certain number of holiday treats to equal an instant win, the prize will be automatically added to your TopCashback account within 48-72 hours. Return each day to increase your chances for instant wins and gain more entries to the grand prize. There are thousands of instant wins in the form of some of our favorite holiday icons that range in value from $0.25 to $100 each.