xeloraaudio.com is a one-person audio software shop. Every plugin here started as something missing from a mix, got built, got used on real work, and only then got released.
The rule for what ships: it has to survive a session. If it does not hold up under a deadline, it does not go on the site.
The plugins are free because the alternative — a licensing server, a checkout flow, a support queue about activation — would take the time that goes into building them.