Give that "good" aligned get pure good, holy weapons which affect MOST of the creatures in the game heres some options for the neutrals.
Infected Dart
1d4 critical 19-20
10% chance of inflicting disease X
Not usable by Good
Poison Arrow
10% chance of inflicting poison X
Not usable by good
They could have a UMD use but it would need to be very high to overcome the alignment restriction.