Read-only tools that check whether code, and the tests that claim it works, are real.
Free
One server, in security & testing. Read-only tools that check whether code, and the tests that claim it works, are real.
Security & Testing
Read-only tools that check whether code, and the tests that claim it works, are real.
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.