There are various websites and platforms that allow users to earn free bitcoins. Some of the top ways to earn free bitcoins include playing BTC games, completing surveys, participating in bitcoin mining, taking part in bitcoin trading, using crypto reward apps, performing microtasks on crypto faucet sites, and using browser or browser extensions. Some popular platforms for earning free bitcoins include Coinbase Earn, CoinTiply, and FreeBitcoin. It's important to note that the value of bitcoins can fluctuate and there is always some risk involved in investing in cryptocurrencies.