op amp circuit application
It is a variable frequency oscillator with a triangle wave output at Vb. The first amplifier is used as a comparator (so only some op-amps would be suitable) with hysteresis set by the saturation voltages of the amplifier and R1/R2 ratio. 

The square wave output of the comparator is fed to the integrator. 

The period will be determined by the time it takes for the integrator to slew between the two transition voltages of the comparator. If the saturation voltages of the comparator are close to each other (implying usually that the positive and negative supply voltages are fairly close, perhaps with a bit bigger positive supply for a 'single supply' op amp) then the triangle wave will be fairly symmetrical and the square wave close to 50% duty cycle. 

The period will be proportional to the sum of the 100K pot resistance plus R, so the frequency will be proportional to the reciprocal of the pot rotation angle from 0 ohms, ignoring R. That means it might be quite nonlinear (if you had R=1K ohms, and the frequency went from 100Hz to ~10kHz, the bottom 1% part of the pot resistance would change the frequency from 5kHz to 10kHz).