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Oculus
OGDragon +
Oh tYou'llmes You'll Go
Open Computers
OpenBlocks
OpenBlocks Elevator
OpenComputers (Core)
OpenComputers Xnet Driver
OreExcavation
Oritech
PackMenu
Pam's HarvestCraft
Parabox
Patchouli
Pickle Tweaks
PigUtils
Pipe Goggles
Pipe Master 2000
Pipez
Placebo
PlaneFix
Plonk
PneumaticCraft: Repressurized
Pocket Storage
Portable Crafting Table
PortalGun
powah
Practical Logistics 2
Prestige
Pretty Pipes