Allround Automations does currently offer a free student edition. However, they do provide significant discounts for educational institutions, open source contributors, and non-profit organizations. You must contact their sales team directly – sometimes they grant temporary licenses for coursework or research.

PL/SQL Developer 14 is the latest version of the software, which offers a range of features, including:

Security vulnerabilities in older versions won't be patched, leaving your database connections exposed to potential breaches. How to Get PL/SQL Developer 14 Legally

Unfortunately, I couldn't find any free links for a PL/SQL Developer 14 license key. Allround Automations doesn't provide free license keys, and using unauthorized license keys or cracks is against their terms and conditions.