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LS1
LS2
LS1 = Discontinued
Thru-hole low power unipolar stepper driver via DB25 using logic gates and ULN200X

LS2 = Tested-completed
SMT low power unipolar stepper driver via DB25 using logic gates and ULN2003
Full-step only and no current control, .5a per coil and less.

Performace results:
Reliability = high, Speed = relatively low compared to chopper style

UD1 = Started, no prototype
Mid power unipolar stepper driver via DB25, chopper style
First attempt using SLA7078MR

BD1 = Not Started
Mid power bipolar stepper driver via DB25

BD1u = Not Started
Mid power bipolar stepper driver via USB