You're looking for information on SQLGate for Oracle and possibly a keygen from 2021.
For SQLGate for Oracle, I recommend visiting the official website or contacting an authorized reseller to explore legitimate purchasing options.
Caution: I must emphasize that using a keygen (a software tool designed to generate a product key or crack a license) is not recommended. Keygens can:
Recommendations
DbGate: A modern, open-source database client that supports Oracle alongside other SQL and NoSQL databases. It is available for Windows, Linux, and macOS.