Lunar client is a PvP client for Minecraft that includes several optimizations to make the game run more smoothly. Players can download and install it for free.

It might surprise you to find out that Minecraft isn't a free-to-play title. However, you can access a demo of the game on PC or play a 2009 version for free.

There are add-ons that come free with a Realms Plus subscription, with all other packs costing real-world money (via Minecraft Coins), which can be bought in the store directly.