I would use Tekkit or another mod pack, but I don't really want to go back to 1.6 or 1.7. It seems that a lot of the mods are for those 2 versions.
Are there any mods like these for a spigot server?
DrCyano's Power Advantageand it's addons(Steam Advantage and Electric Advantage) may be what you're looking for.
Please don't PM me asking for help, I will just redirect you to the appropriate forum, where there are others who are far more skilled than me.
This is not the signature you are looking for.
Banners and such things
This is exactly what I'm looking for. Thank you :D.
Progressive Automation. It's VERY good.
You might also want to check out Open Computers. It's like Computer Craft, but looks more complicated.