Manage software license keys: issue, suspend and revoke licenses, free machines, see customers.
Free
One server, in other. Manage software license keys: issue, suspend and revoke licenses, free machines, see customers.
Other
Manage software license keys: issue, suspend and revoke licenses, free machines, see customers.
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.