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TrueLink CTO Scott Metzger created a calculator similar to the downloadable interactive tool on this page to assess whether it would be more valuable to use proprietary software to develop new applications rather than an open-source development language such as Java. The key concern: The lines of new code his staff would have to create in each case. Metzger determined that the proprietary software would significantly reduce the amount of code his staff would have to write and support. The proprietary approach, he found, would pay for itself in nine months.