No restrictions, maintainance of the list is still handled by CiroC.
This was a comment about the attitude of people who create an account, fart their usual "Buy my xy stuff for only z euro" in the corner and chime out again without any other "contribution".
This collection is a summary of tools which have proved to be useful in production over some period of time. Adding arbitrary stuff which has not even been tested by the community renders it useless. And yes, the suggestions should come from users, not authors.
Good Luck