Very incomplete list of some of the hundreds, perhaps thousands, of Strike Witches doujinshi in existence. See Doujinshi Collection for what I personally own.
Some non R-18 may be mixed in here, see Doujinshi for the majority non R-18 stuff. No R-18G is listed.
This list will always be missing many contents and thumbnails, and the organization is currently very incomplete, my apologies.