BuildCraft - the all-encompassing transport/mining/building/power mod of the pre-1.6 era. Originally created by SpaceToad, it has received contributions from the who's who of notable modders and is now maintained by AlexIIL.

Source code for really old versions is available here: https://sourceforge.net/projects/buildcraft/

Not all versions are features as part of this project! Some are available in modular form only, as part of the projects below. For this and licensing information, refer to the table below:

Versions	License	Packaging
1.4.1 ~ 1.5_01.3	Public domain (1)	Non-modular only
1.5_01.4	Public domain (1)	Modular only
1.6.5.1 ~ 2.2.4	Unclear (2)	Modular only
2.2.5 ~ 2.2.14	MMPLv1 (3)	Modular only
3.0.0 ~ 3.1.5	MMPLv1 (3)	Modular only
3.2.0 ~ 6.4.x, 7.0.0	MMPLv1	Non-modular only
7.0.1 ~ 7.1.x, 7.2.x	MMPLv1	Both
7.99.0 ~ 7.99.4	MMPLv1 + MPLv2 (4)	Non-modular only
7.99.5 ~ 7.99.19	MMPLv1 + MPLv2 (4)	Both
7.99.20 onwards	MMPLv1 + MPLv2 (4)	Both (5)

• (MMPLv1) - Minecraft Mod Public License
• (MPLv2) - Mozilla Public License Version 2.0
• (1) - Retroactively re-licensed by SpaceToad in 2016.
• (2) - Mostly public domain as per (1), but include contributions by hawkye and plashal whose licensing status is unknown.
• (3) - These may also be mostly public domain, however the source code history for these versions is lost.
• (4) - All licenses listed apply.
• (5) - All versions after 7.99.20 include the compat module inside the all file

This project is the non-modular, or "combined" version of BuildCraft, with every module except Compat. If you want to download only specific modules then you'll need to go to these module projects:

• Core containing the wrench, gears, wooden engine, and a few other things that the other modules make use of. You always need this!
• Builders has the Architect Table, Builder, Filler, and a few related things for building in-world.
• Energy has Oil and Fuel, as well as Stirling and Combustion engines.
• Factory containing the pump, tank, mining well, autoworkbench, etc.
• Transport containing pipes!
• Silicon contains logic gates, a laser system and laser tables to make more advanced items.
• Robotics contains robots!

The following modules are separate from BuildCraft itself before 7.99.20, and as such serve the role of add-ons:

• Compat for enhanced compatibility with other mods.

There's also a separate Lib module, containing only code used by the rest of buildcraft. You only need to download it if another mod requires it but you don't have Core/All.