Wave is a function generator.
It's based on the XR-2206 from Exar, and the board is a retired one from Sparkfun. The design is based on a circuit presented on the datasheet itself, so nothing fancy here.
The power supply for the function generator is a custom one, called Source, built with gEDA. gEDA is a full GPL'd suite and toolkit of Electronic Design Automation tools. The result is available here (for direct use with gschem + pcb, both part of the toolkit). The design includes the power supply for the signal generator itself plus 2 more channels, 1 asymmetric (3A max) and 1 normal (1A max). The prototype thing:
The real thing:
