Litematica is a client-side schematic mod for Minecraft, with also lots of extra functionality especially for creative mode (such as schematic pasting, area cloning, moving, filling, deletion).
It's primarily developed on MC 1.12.2 for LiteLoader. It has also been ported to Rift on MC 1.13.2, and for Fabric on MC 1.14 and later. There are also Forge versions for 1.12.2, and Forge ports for 1.14.4+ are also planned, but Forge will need to start shipping the Mixin library before those can happen.
Litematica was started as an alternative for Schematica, for players who don't want to have Forge installed on their client, and that's why it was developed for Liteloader.
For compiled builds (= downloads), see:
gradlew setupDecompWorkspace(unless you have already done it once for another project on the same 1.12.x MC version and mappings and the same mod loader, Forge or LiteLoader)
gradlew buildto build the mod
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