- Kosta produced Australia's first and best selling byzantine music album ''Byzantium" through then Festival Records, recorded live in the crypt of St Mary's Cathedral in Hyde Park, Sydney and performed by the Australian Byzantine Choir.
- In 1994 as an unemployed journalism graduate he launched a weekly employment, education and training weekly newspaper The Employment Post. In 1995 he was appointed Editor of Internet Australasia magazine, the country's first by ISP Ausnet.
- Kosta founded with associate Peter Lord, The Green Room app: the world's first of its kind, free networking resource for indie filmmakers. After launching a basic version whilst raising funds to develop it further, Kosta and Peter decided to support fellow indie filmmakers by giving away $50,000 in development funds to some 15 indie projects. Unfortunately, the promising app was abruptly shut down as a result of the pandemic.
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