SpaceX, Boeing, and Sierra Nevada Corp. SpaceX is certainly farthest along but the CST-100 is a fairly mature design as well, and SNC have already completed cap

SpaceX, Boeing, and Sierra Nevada Corp. SpaceX is certainly farthest along but the CST-100 is a fairly mature design as well, and SNC have already completed captive carry tests on DreamChaser test models. With any luck there may be 3 separate manned spacecraft being made by American companies within the next 5 years.