Old Glory, Peter Pig, QRF, et al - 15mm figures
Charlie Company - 20mm figures from RAFM
FAA/Qualitycast - 20mm figures (Very nice!)
SHQ - 20mm figures (Nice but thin and fragile)
Baker Company - 25mm figures from 19th Cent.
Battlehonors - 25mm figures from 19th Cent.
Westwind (Old Glory) - 25mm figures from Oldglory
The London Warroom - 25mm figures
1 or 2 other small lines out there but nothing to speak of...
A new line of 25mm Nam minis is in the works at Assaultgroup sculpted by an ex-Foundry sculptor.
HLBPS - 1/48 scale figures - This line has recently changed hands or something so I'm unsure of it's current situation.