Even in smaller companies, some custom internal tools can be essential. Even in my own personal use, some custom tools can be useful or essential. But a large

Even in smaller companies, some custom internal tools can be essential. Even in my own personal use, some custom tools can be useful or essential. But a large company probably has at least one unessential tool meeting a need better filled by something off the shelf, just by a matter of statistics. There can be all sorts of legitimate reasons this happened other than NIH Syndrome (it predated the off-the-shelf solution, it couldn't be found despite research, regulatory requirements, etc.) but NIH Syndrome is one to watch out for.