For free coins there are an array of possibilities, where projects and sorts have airdrops, signature, translation or video projects.
One such project I personally support is Snowgem(SNG) https://snowgem.org

They currently a campaign running: "There is 100 SNG bounty for SnowGem video in any language, explaining it's features and maybe a guide how to setup mining."

Current exchanges supporting the coin https://stocks.exchange/trade/SNG/BTC to checkout value.

Masternodes are in the planning phase for Q3 2018, most probably creating the most value for this project for each owner/holder(hodler) of this coin.

Happy coining!