Zebralight SC51w and SC60w - great neutral lights.
Dereelight has quite a few neutral drop-ins available for their lights.
Fenix LD25 and LD40 (both only come in neutral)
EagleTac has some neutral options for quite a few of their lights (P20C2, T20C2, etc)
Malkoff M61w in an MD2 body (get the high/low ring) or M31w in a little twisty body
Nailbender will make neutral dropins and you can use a solarforce host (L2P, L2r, etc)
If you want a super high output light, Kevin at Lambda lights will allow you to choose a 4500k tint and he will de-dome an SST-50 or SST-90 which will make it very warm.
ThruNite Neutrons (as mentioned above)
Xeno also has some neutral lights.
There are a lot more choices. Thise are off the top of my head.