We are always looking to get in touch with passionate people and possible collaborators.
Where open source model has been adopted we did not see a great business advantage.
Marketcetera.... how many opensource contributors?
ActiveQuant ? more contributors but the main framework has been developed by a few people.
We have chosen to remain close source, however the software is free for everyone with educational or personal purpose. We believe this is a balanced offer :-)
In the future we might consider open source if it proves a more winning strategy.
You are welcome to share your feedback.
Thank you
Alberto