Need a max. voltage of 3.3 V for your programming board or sensor? This buck regulator by Pololu takes an input voltage of up to 50 V and reduces it to a voltage and continuous output current of 3.3 V and 3.6 A.
This multifunctional USB battery charger can support up to 4 Li-Ion or Ni-MH batteries. It tells you the selected current and the selected output voltage as well as extensive information on the charging process.