sov

Legendary Skial King
The Rocket Mod is fun (idk what it is called though) but you basically built a rocket and built the detonator button so that it launches. There's also one like that except not a rocket but a bomb.
 

dgoodman

Spectacularly Lethal Soldier
Contributor
I rather like the major tech mods out there like Buildcraft, Industrialcraft, Redpower, Forestry, Thermal Expansion, Factorization.

Computercraft, Portalgun, a bunch of IC addons and Railcraft, Mystcraft, ExtraBiomes XL are some other ones I like to play with too.

http://feed-the-beast.com/
Is a recent modpack that came out for 1.4.2 you can try, if some of those mods I listed interest you but you don't want to set them up yourself. It includes a bit others too, you can mess around with. I don't play it myself though, I have my own blend of about ~40 or so mods.
 

ModSe7en

Legendary Skial King
Contributor
Optifine and Rei's Minimap are essential for everything.
Even if you have an OP computer, Optifine is useful if you poke around enough.
 
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