Fake facts, each labelled false. Random, search and lookup tools; no key needed.
Free
One server, in other. Fake facts, each labelled false. Random, search and lookup tools; no key needed.
Other
Fake facts, each labelled false. Random, search and lookup tools; no key needed.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.