⚠ License change April 2025: Most of these files are now provided under the terms of AGPLv3 with certain exceptions - click here for more details. (but ARS/MFFS is LGPLv3, and some specific versions are MIT). Each file should contain a file LICENSE.TXT indicating its own license. If it does not, this is a mistake.
You're still allowed to make modpacks and edits, but make sure to follow the new terms. ⚠
If you need exact copies of the old files for some reason, they can be downloaded here, but the new license still applies.