Neutral, sourced, dated facts for choosing software: price, free tier, idle rules, security record.
Free
One server, in research. Neutral, sourced, dated facts for choosing software: price, free tier, idle rules, security record.
Research
Neutral, sourced, dated facts for choosing software: price, free tier, idle rules, security record.
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.