MALTO v4.4 and Mystic v9.0:

1. The preferred method to obtain the software is to send an e-mail to softwarerelease@jpl.nasa.gov.
2. That requester will then receive a form to fill out to get the software.  The form requires information regarding the recipient, including contact information and citizenship, government contracting information, and purpose for use.  This type of distribution enables the development and maintenance of metrics likely to be of greatest interest to the In-Space Propulsion Program, such as level of demand and areas of application of the software.
   Or download it here: [download form]
3. Any governmental agency or anyone who is working under a government contract that requires either software tool can use it royalty free.  Others may be charged a fee, depending on the desired use.
4. Distribution, with the appropriate copyright statements and export marking language, of the software will be through JPL's Software Release process (see above).  Both Mystic and MALTO are ITAR controlled, Category 15F.

OTIS v4.0:

Go to GRC Commercial Technology Office site: 
(http://technology.grc.nasa.gov/)

Click on "New User Registration" if you have not registered with them before, or just sign in if you have registered with them.