These are the primary names under which Ubiquiti sells its own products (wireless access points, switches, routers, cameras, gateways, antennas, and related gear). Purchasing any of these directly contributes to the company:
UniFi — Their flagship line (most popular for home/prosumer/business networking, including access points, switches, Dream Machines, Protect cameras, access control, VoIP phones, etc.)
AmpliFi — Consumer/home mesh Wi-Fi systems (sold under the "Ubiquiti Labs" sub-brand)
EdgeMax / EdgeRouter / EdgeSwitch — Wired routing and switching gear
UISP — ISP/service-provider focused tools and hardware
airMAX / airFiber / GigaBeam / UFiber — Point-to-point wireless, long-range antennas, fiber products, etc.
Key rule: If the product is labeled with any of the above names, is sold on ui websites or through official Ubiquiti channels, avoid it.