PostgreSQL is currently ranked the “most wanted” database according to Stack Overflow, and DB-Engines crowned it DBMS of the year 2020. By the time you read this, PostgreSQL 14, the latest version of the open source database and is a great example of the power of open source. The licence allows it to be shared, used, forked and built upon. Hundreds of different companies, commercial and open source, have created spin-off versions.