This is a challenge to companies which hire either programmers or software engineers to release statistics proving that they treat men and women equally. I understand pay-gap is not the end-all-be-all yardstick of equality so you can break down the statistics by seniority, experience, or any other metrics you like.
The idea is to compile a list of companies which do prioritize treating people equally so that employees can make informed decisions about where they would like to work.