The ACT project has had three generations of cameras, each based on transition-edge-sensor bolometers coupled to silicon lenses. The first of these was the Millimeter Bolometric Array Camera (MBAC), which made CMB observations from 2007 to 2010. The second was ACTPol, which was polarization-sensitive and made CMB observations from 2013-2015. The final camera is AdvACT, which stands for Advanced ACTPol.