Capabilities, with the state of each one on the record
Each card below is one canonical catalogue record. The badge on it is the commercial state stored on that record rather than a marketing decision, and a Buy button appears only where the record says the capability is actually on sale.
A product is listed here only once it exists as a catalogue record. It is on sale only when that record sits in a state that permits sale, carries a price, and its capability set validates against the published vocabulary.
Filter by what you want done
Categories come from the catalogue itself. A category with nothing published inside it is still shown, and the page then says so plainly instead of hiding the fact.
Free
0 products are published under this filter. Both ladders are shown on every card: the commercial state, which decides whether money may change hands, and the engineering state, which says how far the build has actually got.
What this page will not do
It will not show a Buy button for something that is not built, it will not round a price up or down, and it will not describe a capability as working because a card for it exists. The authoritative per-capability status is on each product page, together with the capability vocabulary those pages are checked against.