This is their website:
http://www.wwiies.com/
They do the same thing as desastersoft or any addon maker only difference is that they support modded maps and aircraft (the packages only include bmp and mis files as usual!).
I got their BoB and Norway addons and its really nice work, huge amount of missions with good action, many planes in the air but mission briefings are in spanish because they speak spanish.
Btw I never heard or read about this "need for buying a 1c licence" although I was involved in many addon projects.