PL/SQL Developer 14 (and the current version 15/16), there is no official "free" license key. The software is proprietary and requires a paid license from Allround Automations for permanent use. Allround Automations Legitimate License Options
Title: A Professional Review of PL/SQL Developer 14: Licensing, Features, and Value
When choosing a PL/SQL Developer 14 license key, here are some tips to keep in mind:
(Note: This is an example; use your actual filename and credentials.) PL/SQL Developer - Allround Automations