pgAdmin is an open source management tool for Postgres. pgAdmin 4 is a completely new client, intended to replace the older pgAdmin III.

pgAdmin 4 is designed to meet the needs of both novice and experienced Postgres users alike, providing a powerful graphical interface that simplifies the creation, maintenance and use of database objects.

It is a management tool for PostgreSQL and derivative relational databases such as EnterpriseDB's EDB Advanced Server. It may be run either as a web or desktop application.

[source: https://www.pgadmin.org/ ]