Professional BGA reworking station (to melt the solder)
A suction pen (Comes standard on most reworking stations. it pulls the BGA from the motherboard)
A reballing kit with stencils for the the chip you are reballing
solder balls (preferably leaded)
flux
Okay reworking station, not a top of the line one:
Ideal Reballing Kit w/ stack of stencils next to it: