Are these really capacitors?
They're all very normal (albeit old-fashioned through-hole) capacitors of three different types. The cylindrical ones are electrolytic, good for high capacitance in a small space, but polarized and have a limited life. Used where precise capacitance value is not too important, such as power supply filters and non-critical coupling and timing. 

The rectangular ones are film type, good for low leakage and moderate capacitance. Moderate stability with temperature. 

The dipped ones are ceramic disk capacitors, good AC characteristics and good for small to moderate capacitance. At the 100pF level they also will have good stability with temperature.