General Mission Analysis Tool GMAT

it was open source software provided by NASA, in sourceforge

tutorial from NASA NTRS

DSLWP-B satellite

DSLWP amateur radio team

Nico Janssen's Amateur Deep Space Tracking

Nico Janssen's twitter PA0DLO

Lucky-7 orbit determination

Thinking System

and GMAT API 

matlab interface 

GMAT wiki from atlassian