Charles Simonyi—the Hungarian-born engineer who built the first WYSIWYG word processor at Xerox PARC and later oversaw the development of Excel and Word as one of the first employees at Microsoft—has founded his own company, hoping to reinvent the Byzantine world of computer programming. His company, Intentional Software, aims to give almost everyone the means to build elaborate apps. You simply tell your computer what you intend to build, and the computer does the rest. "It is clear that the precise recording and editing of human intentions in a machine-processable form is a necessary step to improvements in the building of software," says Simonyi. He calls the idea self-writing software. In much the same way that Excel adds a column of numbers, Intentional's tools will fashion your free-form descriptions into a working app.

E.g.: another advantage for self-written software is ... https://books.google.com.ua/books?id=0U1ODwAAQBAJ&pg=PT2255&...

*

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Note added at 26 mins (2018-03-14 06:30:12 GMT)
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Для надежности можно использовать кавычки:

“home-made” software


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Note added at 28 mins (2018-03-14 06:32:06 GMT)
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Здесь «самописное» — самопальное, кустарное и т.д.

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Note added at 29 mins (2018-03-14 06:32:46 GMT)
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А то сейчас набегут гиганты мысли с самописцами. :)

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Note added at 31 mins (2018-03-14 06:35:17 GMT)
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Гуглоссылка:
"самописное программное обеспечение"
https://www.google.com/search?q="самописное программное обес...


Нашел ссылку на старую тему:
самописная система управления
https://www.proz.com/kudoz/russian_to_english/engineering_ge...


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Note added at 2 hrs (2018-03-14 08:55:32 GMT)
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Альтернативная версия:

home-grown software


terminology - Formal word for "Home Made" - English Language & Usage Stack Exchange
https://english.stackexchange.com/questions/170158/formal-wo...

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Note added at 6 hrs (2018-03-14 12:06:43 GMT)
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На всякий случай уточняю, что «кустарное» здесь означает, что ПО разработали своими силами (что называется, на коленке), вместо того, чтобы приобрести коммерческий программный продукт (скорее всего, прошедший сертификацию).


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Note added at 22 hrs (2018-03-15 05:00:58 GMT)
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Более солидный вариант:

in-house developed software

Навеяно ответом, который дал VASKON.


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Note added at 23 hrs (2018-03-15 05:04:03 GMT)
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Вариант покороче:

in-house software


In-house software - Wikipedia
https://en.wikipedia.org/wiki/In-house_software
== BEGIN QUOTE ==

In-house software is a software that is produced by a corporate entity for purpose of using it within the organization. In-house software however may later become available for commercial use upon sole discretion of the developing organization. The need to develop such software may arise depending on many circumstances which may be non-availability of the software in the market, potentiality or ability of the corporation to develop such software or to customize a software based on the corporate organization's need.

== END QUOTE ==