B.A.S.E is a library used by mods from Team Acronym Coders and Brass Goggled Coders, available for Forge on Minecraft 1.10–1.12.2. Its former material creation features and ZenScript handling now belong to ContentTweaker. The authors allow it in both private and publicly distributed modpacks.
When your pack needs B.A.S.E, rent your own Minecraft server and install the library with one click from the server panel.