NASA releases are done twice a year and integrate external contributions. They are frozen stable versions that are recommended for beginners.
According to the NASA Open Source User Agreement Version 1.3 : “In an effort to track usage and maintain accurate records of the Subject Software, each Recipient is requested to register. Recipient’s name and personal information shall be used for statistical purposes only.”
Please just send us an email (firstname.lastname@example.org) with your Name and Affiliation. We are also interested in knowing a little about your projects if this is something you can share.
If you are interested in the development version or would like to contribute, please join the Git project.