The VCLFO 9D is a simple-to-use 0-5V voltage-controlled LFO chip with many more features than your average LFO. For a start, it can produce 7 basic waveforms, and also includes a noise source. It can also distort its waveforms under CV control, well beyond basic PWM.
There is an optional sample-and-hold module that can sample whatever is selected, the current waveform or the noise source. The LFO frequency, waveform selection, waveform distortion, and S&H rate are all voltage-controlled using 0-5V. The overall output level is also voltage-controlled.Download Electric Druid VCLFO Datasheet
The datasheet includes example circuit diagrams, example waveforms, and the chip pinout diagram.
For further details, please see the VCLFO Project page