Sure there is a company (Whispersystems) doing most the work behind it. As they state: "dedicated development is supported by community donations and grants". This is good, it allows for very focused development.
Open WhisperSystems isn't a company. WhisperSystems was a company, it was acquired by Twitter which open sourced TextSecure. OWS, is just a name for the community effort around these tools: https://whispersystems.org/about/