Buildcraft additions is an addon to buildcraft, so you'l need it for this mod to work.
Official site: http://www.aenterprise.info/BCA-docs/

not all information about the mod is here in this post just because it is to much information and the post was getting to long so here are the links to the pages on the wiki:

For the full list of features and how to use them check the wiki linked above

There is also a mod spotlight available made with chilm (2 parts)

I realy hope you guys enjoy it!
Folow me on twitter for updates on development: @AEnterprise1
Official IRC chanel on irc.esper.net: #buildcraftAdditions

Modpacks

You don’t need to ask me for permission to include this mod in your modpack, no problems at all just give me credit for my work, a link to the site or this page. I would also apreciate it if you let me know if you used my addon in a modpack