Utilize the input text as a context reference, choose the right relationship between 'Aconex' and 'software' from the options.
Options: distribution format, stock exchange, product/material produced, legal form

Their software – for which Aconex typically charges clients 0.1 per cent of a project's value – integrates document and information management systems across different firms that work on projects, while verifying and checking data and eliminating data errors.
product/material produced