Retina

Retina casts rays from the player's view and returns the block or entity they point at. It handles hitboxes beyond a full cube, covering both blocks and entities, and it does not depend on entity teleportation, so it runs slightly faster on average. A server needs it installed, while a player's client may add it. The library exposes many customizable input parameters and returns detailed output, which suits custom maps, datapacks, magic wands, guns and block placement such as laser beams. It is published for Fabric, Forge, NeoForge and Quilt, plus a data pack variant, across 1.20 – 1.21.5, and is open source under The Unlicense.